I installed v2 yesterday. Didn't bother to uninstall the previous version and it only had a problem with one plug-in - one I'd forgotten was there and probably used once.
I didn't like the way the tabs had a close button on each window - I was too used to having the single X at the end and found myself closing windows I'd just opened! Found a fix for that though so that's good.
I like the 'recently closed tabs' function - came in hand for the above problem lol