They feel fantastic.  For this item, if you are going to wear them as an undergarment, rather than sleepwear, you might want to order a size smaller than what you normally wear.  I wear large, but Medium fits very, very nicely as underwear.

As for this seller, I had a defect in an item I had received from them.  They were very prompt in replacing it.  I will definitely be a repeat customer.  Finally, their standard of quality for their products is very high.  Best I've seen.