Thought I'd give a brief review of my first and only merino T.
Size is pretty good fitting. It's not athletic cut but not baggy either. I'd say it's a good comfortable fit. BUT it is not soft at least to me. Since this is the only merino T I have it's hard to say how soft or itchy. It does itch a little bit and I found myself scratching a few times. It's not bad but it is a minor inconvenience. I'd like to know what others feel like.
Tested it by running 4 consecutive days without washing. I sweat... a lot. So it didn't smell at all. I had to wash it only because of the sweat steaks. It does wick sweat well but gets clammy. Does dry out in a few hours.
So for keeping odor at bay and looking cool, I'm willing to forgo the minor inconvenience of it being a bit itchy.