I was on Yosemite beta for about a month. I opted in because I was excited about the new features. I like the new look and many features that I don't need repeat here. But, whatever potentials it has, it still has some annoying bugs that prevent me from using it. That is why I reinstalled 10.9 at the breaking dawn of public releaseI never thought I would do this as being a long-time believer of OS X. So for the bugs: 1. Bluetooth: I use wireless keyboard, trackpad made by Apple and a Pioneer sound bar with my mac. If I turned off the laptop (not sleep) or carried it outside, I would most likely have a hard time to reconnect my wireless accessories with my mac. However, I can reconnect them with no problem, if I restarted the accessories. After I restored to Mavericks, I never had this problem again. So it seems to me the problem is on Yosemite not accessories. 2. Wifi connection: I have 2 routers at home. One is from FiOS and the other is Airport express. They are not separated far away. I use airport express because I want to connect it to a printer thru USB. Yosemite always had problem to detect both hotspots. Say if I switched to a diff router, my experience tells me WiFi on 10.10 wouldn't find it. Many times, I need wait for a few minutes or just do it manually. Problem gone after restored to 10.9. 3. Apple Mail: I use Gmail and Me.com in Apple Mail. I don't remember if it was the first day I installed 10.10 beta and found the issue with Junk Mail Filter. In 10.10 beta, junk mails sent to Me.com were not censored by stock mail app at all, even though the settings for junk mail remained untouched. None of the junk mails filtered in 10.9 ever got marked out and moved to Junk folder in 10.10. Same as bluetooth bug, Mail started to filter immediately after 10.9 was restored. These are just the bugs I experienced. I love Yosemite, or I wouldn't download beta 2 to main drive. But it has been bittersweet. What do you guys think? Has 10.10 beta/dev been smooth enough for you? Will you upgrade to public release immediately?