I own a ton of Merino stuff. Smart wool, Icebreaker, Ibex & Stoic. My far the best merino T-shirt out there. Odor free. Can wear for days. Starts out soft outta the box. Becomes a 2nd skin after a few wearings. I've washed by hand to this point. No dryer. Minimal shrinkage. Only negative I've read is that you could easily rip the t-shirt if its soaked and you peel it off too quickly. Possible I suppose. Its a function of the merino knit I guess. Hasn't been problem for me. These seem to be designed to be skin-tight. For me, that doesn't look great on its own. I tend to wear this as an undershirt. I'm normally an L / XL. The XL is even a little snug. Stretches a bit with age. My guess is that the dryer would shrink this up quite a bit. I own 3 of these. Combined with the Ibex Shak, its really an unbeatable combo.
As far as the quality of the wool, these are absolutely fantastic. They do not itch, Do not smell. Dry really fast. Clean up really easily. Fit exceedingly well. Keep you warm in the cold and do NOT heat you up in the heat. In fact, in the heat you are better off in one of these than without, because it instantly wicks away your sweat to give you a better cooling effect than a bunch of sweat running down and dripping ever can.