I've tried three different types of Separatec underwear and directly interacted with their customer service team. I'm stunned by the quality of both.

The underwear is brilliantly engineered. I'd be shocked were anyone disappointed by the design or if anyone were to like it less than traditional underwear.

I've tried the polyamide/spandex sports boxer briefs, the polyester/cotton/spandex sports boxer briefs, and the polyester/spandex sports boxer briefs. As to the fabrics, I prefer the polyamide/spandex blend. I would describe them each as follows:
Polyamide/spandex: thin and supportive. Not heavy.
Polyester/cotton/spandex: supportive but heavier and thicker. Feels a bit warm, to me (but I live in Florida; would be better in gentler weather).
Polyester/spandex: thin and light but less supportive. Harder to position properly due to the fabric.

I failed to return the polyester/spandex blend within Amazon's return period and contacted Separatec to ask about returning after an extended delay. They still took care of me. The service was above and beyond. I am absolutely stunned by the effort and kindness they showed in the service they provided, despite my extended delay.

The customer service is top notch. These folks will not allow you to be disappointed. They'll take care of you. So, if you're on the fence, give Separatec a try. It's really, genuinely, a risk-free thing. They want you to be happy and they proved that in the way they took care of me.

I wore these at work for 8 hours, a demanding job but it's air-conditioned. The boxers I'm used to would leave me chafed some days but that did not occur with these. I found them kind of strange at first, and I noticed them throughout the day, but I think that's because I'm not used to that much support.

Only con is the hole is too small. However, everything else is fine.

These underwear are a fantastic idea yet have significant design flaws. First the good: the fabric is awesome. Soft and doesn't ride up the legs. Now the bad: 1) Extremely hard to get everything settled in place correctly. 2) No fly! So every time you need to pee, you also need to go through the entire Houdini process. 3) The flap that separates your "junk" from your scrotum, does not stay in place, it always falls down. 4) There is an opening at the bottom of where the scrotum sits. I guess it's for ventilation, but I don't like it at all. and 6) The opening that allows you to place your "stuff" in the pouch is far too small. With all that said, if they fix these issues these would be five stars. Haven't decided if I am going to keep them and be frustrated or return them. I am clearly in a love/hate relationship with them. I have heard of "better" brands but I refuse to pay $30+ for a single pair of underwear. I feel these are priced right.

I bought this style/fabric blend to compare with quick dry briefs. I don't like either style. These were a little heavier which I liked. But, the waistband was very uncomfortable and kept rolling. As with the other style the hole is too big for the junk and it does not keep in place and/or separated after some wear. I regret buying both styles.

I'm a recent fan of Separatec and now own 7 styles of drawers! I train in the gym regularly (at least 3-4 times a week), which can lead to some discomfort and too much sweat in the groin area. The dual-pouch system is ingenious! For me, it's much more comfortable to have the twig separated from the berries. The dual-pouch system keeps the groin area drier than other drawers, even during intense training workouts. There’s much less friction and it’s pretty simple to guide my member into the hole of the front pouch and sack into the lower pouch. Using the restroom is easy too; just lift up the front pouch and pull out.

These drawers fit well and do an excellent job forming to my upper thighs and glutes. I don’t have an issue with them riding up throughout the day.

Like the styles that are made of bamboo rayon, these are really light and breathable, owing to the 57% cotton fabric, which is helpful on days when it’s really hot outside.

The one con about these is that they’re not quite “black” as they appear online; they’re more of a grey. The elastic band is black, but the rest of the drawers aren’t.

Like all the Separatec drawers I own, I highly recommend these for other men who train or are active.

Wow, where to begin. Although my wife is disturbed by the more pronounced (than usual, wink wink) bulge these undies create due to their separating nature, I'm greatly enjoying them.

The distinct pouches for the twig and berries do indeed make things down south much less humid. It takes a bit of time to remember to use the dongle cozy, but it starts to become second nature soon enough.

I've finally found the right drawers. Love the long legs, the double pouch. As advertised, they keep everything up and out. I have tried the Micro Modal fabric version. I like these much better.

These are the best underwear I've ever worn. The separate pouches keep things cool and from chaffing, and adjustments are rarely needed. My only complaints are with sizing: One, there is a large jump in size between large and XL (the large are more like medium boy shorts). Two, the main pouch's size correlates to the underwear size. For example, the pouch on the XL fits my junk perfectly (although it does allow for too much hang, imo), but the large's pouch is MUCH smaller and my junk does not fit comfortably AT ALL. I wish there were options to mix and match sizes... i.e. Large underwear with XL pouch. That said, they're still amazing and I only wear traditional boxer briefs on laundry day now.

I got this underwear for my boyfriend. Asked him to write the review:
The material is very comfortable, and the fit is snug. Not too loose and not too tight. Now the star of the show is clearly the separate housing for the Frank and beans. At first it was kind of strange, but after a while you don't even notice it. It's nice having them in their own rooms, that way they don't stick together and there's less adjustment needed throughout the day.

Bought it for my dad. It’s a bit too loose for him but overall is good. He likes the texture, it’s cool and soft.

Uparalleled comfort. Same size on other models fits well, but this is somewhat large.

ウエストサイズは、やや小さめですが、そのつくり、機能、Amazonのショッピングでは、久々に満足出来る商品でした。
内側のホールの位置が、もう少し（1ｃｍ）下ならば、私には、最高でした。
可能性としては、ホールの形状を楕円にして、上下に1ｃｍづつ大きくしてもらえば、多くの人に適応出来ると思いました。
位置は、人によりますから～(笑)