I can tell you the blessed OS has a couple annoying bugs like
1. Vvm - when playing back a vvm, screen goes blank and you can not do anything until the voicemail is finished playing. (A real pita if you have longwinded messages)
2. Sound profiles are a mess. Sometimes I get notification sounds, sometimes no.
3. Lately I'm getting complaints about low call volume. People I speak to can't hear me or its garbled. Very annoying.
So....I'm in the process of debating which leak or other os options I have, but each time I decide on one....another leak comes out, so I haven't changed from the stock os. Oy vey
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