I got my Merino tops and bottoms last week. They subsequently went back to the company tonight.
1. They were itchy. They weren't extremely itchy, so if you wear wool often you may not mind, but I have sensitive skin, especially with tighter fitting clothes and it was an annoyance for me that I couldn't overlook. I tried them on and wore them around the house 3 times and it didn't change over time, I still noticed it.
2. They were HEAVY. The XXL short sleeve weighed 14 oz and the long sleeve was 17 oz. I didn't even bother with the pants. I have no need to carry close to 3 pds in 3 clothing items. Also, I'm sure they could be used in the summer (i.e. hydrophobic, don't smell, etc), but they were so heavy I wouldn't want to. I REALLY wish Smartwool would make a loose fitting XXL or 3XL... I'd buy out the supply.
3. (although not a reason they were sent back) - As mentioned by others, they run large. I got the XXL and they easily could have passed for 3XL or 4XL. Again, since I like looser fitting clothes, I wouldn't have minded this, but others who want a closer/tighter fit would have.
Hope this helps people on future purchases.
OH - And the Coyote Brown is actually a pretty nice color. I didn't mind it at all, it's certainly not beige, but darker.