I am a fan of the Jetbrains IDE lines, and have been a propoent of AppCode within my company. When I saw 2.0 was out, i upgraded right away.
Its been a pretty miserable experience. The IDE freezes all the time doing simple tasks. I think they are largely related to OC-3286 but I have encountered other cases where the IDE freezes for a good 5-20 seconds. Not sure how bugs are being prioritized, but this one has been reported for 12 months and has a ton more votes than anything else I see.
At this point I would caution anyone considering upgrading to do a trial before buying. I am warning my team to stay away until it works properly.