I find wool itchy, must be one of my allergies.

Merino wool is worth every cent paid no matter what the season. Yes I was skeptical too about a wool t-shirt in summer. And merino wool socks have no equal. Itch is not a word ever used to describe merino wool.

I have not heard of "wool power".  Have been wearing merino wool for several years now and love it!  Wear it in the BW, for cold football days (like today) and whenever I need a base layer.  If it gets warmer I am never uncomfortable in it.  Never gets clammy and sweaty, never seems to get smelly.  Not the least bit itchy.  Far softer and more comfortable than cotton or even silk.

Pricey, worth every penny in my opinion.  Spartan1 switched over recently and he agrees, I think.  He will wear his today, too.

I watch "Steep and Cheap" and get it when it is on half-price.  

I switched over to Merino wool socks for winter wear all of the time a few years ago after finding how comfortable they were on trips, now I wear them three seasons 100%.  Gave all of my cotton socks to Goodwill.

Baaa!   

I've had a Sierra Trading Post MyUpdates subscription set for 'merino' since May. Ideally, I want to try a crew neck top, long sleeves, tall with a small percentage nylon or something for shape retention. Best price I've seen was $60 but it wasn't a tall so I'm still looking. If you see anything I'd appreciate a heads-up if you think of it.

I did snag a doufold cotton merino blend from Fleet Farm a while back. I'm wearing it right now. Even though it has cotton next to the skin I find it a little itchy but tolerably so. It was under $20 retail so perhaps the merino isn't the best quality?

This may sound weird but that's never stopped me before so...
I can wear a next to the skin cotton top for a week on a trip easy. Anything poly, you name it, I can't stand wearing next to the skin for more than a day or two. The best description of why is it simply makes my skin hurt to the point I have to put a t-shirt under it and my arms are still unhappy after day three.

If anyone with half a clue what I'm talking about with some merino experience can comment I'd appreciate it. I can live with a mid forearm sleeve length and sometimes that's a plus but I don't need any more $60 thermal underwear for sledding and ice skating. I have numerous weights and enough for a full load in the washer already.

Just to add a few points not made yet.

Comfort; I think as we get older our metabolism slows down. IMO Wool feels warmer when I'm not moving and generating heat from physical activity.

Safety; Skin burns aren't as bad with wool if that should ever happen. Synthetics are a petroleum produce and campfires are usually involved with canoe camping. Not a great mix. During the Falkland wars the British reissued wool to all ther seamen after they experienced the results of a missile attack on one of there ships. Nasty wounds, with melted plastic embedded in the skin.