It's hard to believe how thin and strong this thread can be. After years of learning how to go easy on 8/0 so it doesn't break off (and going easy on 6/0 and 3/0 so it doesn't over-bulk) along comes this stuff that you can pretty much do anything with and it forgives: extra wraps? you won't see them. Heavy tightening? go ahead, make my day. It doesn't have the greatest range of colours, but for the last year and a half, 90% of my wet flies and nymphs and dries have been tied with black, white, tan and olive Veevus 8/0 thread.
8/0 thread is my all purpose thread when tying most of my flies. Veevus 8/0 has a higher breaking strength than similar diameter threads from other manufacturers, so I don't have to worry about it breaking when I apply tight wraps around my material. I love this stuff and always recommend it when people ask which thread to use.