I've been testing WoolX's line Lightweight Merino Wool clothing since June. I've been very happy with it. Merino is new to me, so I don't have an extensive direct comparison with merino from other manufacturers, but being someone that had only used synthethic clothing prior to WoolX, I now consider myself a merino convert.
If merino fits your budget, I highly recommend giving WoolX a try!
Here's a link to my full review:
Gear Review: WoolX Lightweight Merino Wool Baselayer Series – T-shirt, Hoodie & Boxers