So, the silk is pretty nice. I got the green one cuz it was a few bucks cheaper. You don't really notice the niceness of the silk until you put it on. Then it feels really nice. But there are four problems with getting this item:

1. These things actually ride up in my backside more than my super-short boxers do. May have something to do with there being more material to ride up.
2. The tags on the back waistline are not designed to be removed. This is an issue for people with sensitive skin like me, or who want maximum comfort. I removed the tags anyway and it actually removes the waist seam and leaves a big hole. It will probably let all the waist threading come out eventually, but I feel like I won't even wear them with the tags in there so I did it anyway.
3. The double-flap front hole system is sort of unnecessary. They should just have a one-flap button system.
4. For the above three reasons, there's really no sense in getting one pair of these when I could get three better overall pair at Kohl's for the same price. Those are actually designed to have the tags removed, they ride up less than this pair does, and they have a one-flap system in front. And actually they are really soft too, albeit a different kind of soft.

Unless there's some reason you must have this exact silk material, I would not buy. Save some money.
P.S. This is a side note that I didn't factor into my review, but these things are actually too smooth. You wouldn't think that's possible, but it is. They were so smooth and frictionless that I actually started to slide out of my office chair while trying to get some work done. It was such a weird thing I started laughing when it happened. But seriously, these boxers didn't have enough friction to keep my behind stationary, whether I was wearing pants or not. I tried it both ways. Be warned. :)

SEVERAL MONTHS LATER:
The one pair I have has actually become my favorite home pair. I use them for lounging around and when I want to relax. But I would still not wear them outside of the house. They are too slippery and distracting while I'm at work, plus they ride up, and it's hard to pull out wedgies every few minutes when you're in public. But for when I'm at home watching a movie on the couch, I'm not moving around and it doesn't bother me. So I have changed my review from 3 to 4 stars because I feel that while I would not get 7 pairs of these for 7 days of the week, having 2 pair for home seems like a very practical purpose for them.