When I first seen these, I laughed. I thought that they were ridiculous. But then it struck me, I'm not a huge fan of "bulky" clothing (like a mock turtleneck and polo, etc.) because on those odd Spring/Summer days it'll be chilly in the A.M. and then 30* warmer after noon. Since I'm an early bird golfer, it makes since to have these. Sometimes I'm on the course all day long, from sunrise to sunset. So, when the sun goes down and it starts to get chilly again, these will come in handy then as well. I have 13" biceps, so, I ordered the M/L but had to send them back because I prefer a more snug fit. The M/L fit OK but sometimes when I had a full body coil (driver, long irons, etc.) then they'd slip a little. When I was chipping, putting, etc., they didn't move at all. But now that I have the S/M they don't move at all. They're clipped (they come with a small zippered pouch that can hang on your bag, etc.) right to my Titleist Staff Bag but I'll even wear them when I'm at the range, walking my dogs, and so on. I only purchased one pair (white) but I'm definately going to order a back-up pair (white) and a black pair as well. In my opinion, these are worth every penny.
Pros: Fit, Look, Feel, convenient
Cons: sizes can be a little off for some people