I've a couple of squares (both are solar and pick up the time sync signal) and enjoy wearing them when I do, I've never found the buttons the easiest to operate though. They're quite small, don't protrude much from the case and have a slightly squidgy feel to them. Definitely tricky to operate with gloves on, for example.
I'd try before you buy just in case, the likes of H Samuel normally have a varient or two in stock.