I personally love compression gear. I hated it at first, but once I got used to it, I completely forgot that I'm wearing it.
UA is not shit. It flat out works. Now whether or not they are overpriced is debatable. I get tons of UA gear because I get discounts on them, but some other good brands are Patagonia, SmartWool (yay for merino wool!), and Helly Hansen.
As for compression gear riding up... non-issue for me. I can see it doing that if you get the wrong size though. I find loose fitting clothing rides and bunches up way more. Also, I noticed that compression gear makes me feel better after wearing them. Less soreness. So couple that with good rounds of stretching before and after sessions is awesome. As people have said, the compression absolutely wicks moisture better. That's another huge plus.
For my upcoming tahoe trip, I am going to wear compression cold gear for my first layer and a merino wool mid-layer with my very lightly insulated (60g) jacket. If you wear shells, you could do three layers underneath for colder conditions.
Last edited by Leo; 11-15-2010 at 08:01 AM.