I had installed the various 4.6.1.x releases and got up to 4.6.1.250 and was sitting at that for a while. Then when 5.0.0.100 was leaked, I installed it, and had to give up in just 2 or 3 days -- way too buggy for me, so I reverted to 4.6.1.250. Then, when 5.0.0.130 was leaked, I loaded that, and used it for a week. I *really* liked the features, but the errors got to be more and more annoying, such as:
-- severe memory leaks (25MB in 24 hours)
-- "delete prior" would stop working within 24 to 36 hours after a battery pull
-- delete multiple (highlighting a few and hitting delete) would lock up the screen
-- missed incoming calls --> straight to voicemail even when I had a signal
-- inconsistent missed call indicator
-- inconsistent message waiting indicator
-- no spontaneous restarts, but I HAD to reboot the phone at least 2 or 3 times a day
-- UMA unusable for voice calls -- fluctuate in/out -- terrible despite all fixes

Despite loving the features in 5.0.0.130, it was just way too buggy to use on a phone that I need for business as well as personal use. So I reverted to 4.6.1.250 again.

250 is very stable, and about 95% of what I do on it works very well. I still find UMA less than stellar, as it occasionally drops a call for no apparent reason. But when connected, it's great. In general, 250 is very solid and works well. My primary complaint is simply that it doesn't have the features that 5.x.x.x has.

Looking forward to 5.0.0.140...