I have a couple of the Target brand versions (G9 or something) in short sleeve which I bought at the beginning of the summer. I simply love them! During the summer I wear them by themselves and I sweat like a pig and they dry quickly and I don't look quite so rumpled. During winter, like today, I've got the short sleeve version on as an undershirt and I've never been so comfortable. Usually at work I wear a plain cotton T under my shirts in winter time but not after today!
They've held up very well although I wash mine in cold and then line dry instead of using the dryer (they dry in about 15-30 minutes, faster if I point a fan in their direction). One of them snagged on the velcro pockets of a pair of shorts, so I clipped the snags, removed the velcro and replaced with buttons (which I prefer anyway) and I've never had a problem.
Cost on sale was something like $7 a shirt. I'm going to get some for my 12 yr. old son with the understanding that they are only for camping...otherwise he'll wear it out really quickly!
They're unltra lightweight, silky smooth to the touch (almost like my wife's lingerie...I mean when she's wearing it, not me <img src="/forums/images/graemlins/cool.gif" alt="" />) wicks sweat and dries easily and it's cheap! It's all good.