I don't have anything with merino wool in it. I know there are people who rave over it. Well good luck to them. To me merino is just grossly over hyped.
There are disadvantages too.
It's not an easy care fabric. I just don't have the time to waste on careful washing and drying routines when I'm cleaning my gear after a trip.
Another thing is the merino wool growers in New Zealand include some of the worst farmers for restricting access to mountain lands. They want outdoor people to buy their stuff but then lock the gate when we want to cross their place to go tramping or climbing.
I just noticed something else some people might want to take into account.
Follow this link to see a BBC report on the practice of mulesing. The report is looking at what's being done in Australia but I understand this cruel practice happens in some areas here too.