Just wanted to mention that I got the screen protector from Armorsuit for my S2 Classic. Package of 2 for $7.95 US from Amazon.
It's the kind that you moisten with a little spray bottle before applying it. Followed the instructional video on their Web site, and installation was easy. Just need to do it at a time when you can set the watch down and leave it alone for at least 12 hours to let it dry.
Fit seems very good to me. There's a miniscule gap between the protector and where the watch face ends, but it's next to unnoticeable. The surface of the protector dries to very close to the smoothness of glass, but there is a very very slight "orange peal" texture if you look closely in just the right light.
It's not perfect, but I'll leave it in place until such time that something better comes along. The last thing I want is a scratch on an expensive watch.