Just wore my 3861 for more than 24hours, including overnight. Absolutely no discomfort. Matter of fact, I rarely notice the watch on my wrist at all. I do like to wear my watches, the ones with stainless steel bracelets, a bit on the loose side. Not just with Omega, but with a couple of Rolex OP watches I had. When my wrist is not swollen, I like to be able to fit my little finger fairly tightly under the bracelet, between clasp and bottom of wrist. This allows for more than enough space to still be comfortable when my wrist swells. However, I still don't think that would make a difference.
I do recall reading a thread about a year ago on one of the Rolex forums, about the same issue that a couple of guys had with the Explorer 1 39mm. So I don't believe it's just Omega.
While I don't believe these comments will really help anyone, it is always good to get different perspectives on these issues. And I don't doubt that a few might sincerely find the bracelet uncomfortable. However, I do feel that comments like "Don't buy this watch!" are indeed overly dramatic.