Biggest dissapointment - Remington 597. Unreliable piece of crap.
Biggest surprise - Glock 17. I used to hate Glocks. Could never shoot them well, and they're ugly as sin. Plus, in CA could never take advantage of capacity. After moving to free America, got the opportunity to buy a G17, cheap. Didn't really want to, but 17-round standard capacity mags and 33-round extended ones. With all that combined, I couldn't resist. By now, after 1500 rounds through it, I'm completelly converted. They're simple, light, have capacity for days and don't have too many external controls to confuse things. They're still ugly, but I found beauty in functionality and reliability.
I'll be buying a G19 to keep my G17 company and to use as colder weather carry.