Great post here! But honestly I am having great time with the 4.2GM,yes I had plenty of issues with my Wifi on the "update" to 4.2,like can't connect,ipad can't fetch proper configuration from router and so forth,but later on when I did a "restore" with the 4.2GM file,my problems completely vanished and best of all my wifi range is totally awesome compared to 3.2.2 plus extreme 3G speed. I am not boasting here,it is the truth. I think I won't even update to 4.2 Final unless my GM expires or 4.3 or something like that comes out.
[P.S: My reply sounds semi-offtopic but yea I couldn't resist,because when people complain about something ,which something is doing great with you,you really feel bad. But what the heck? Experiences differ from people to people.]