4.2 full(unlock)+ "Extra speed" tip on my 2G 8Gb:
1. fast
2. Folder are working (little slow, but working stable)
3. Youtube working
4. Maps working
5. Multitask (with switchable backgrounding) it's awesome
6. video not saving in foto folder (but quality is good)
7. battery not drained: 24hours stdb with 15 mins talk+ 3Mb + 3,5 hours in active = 55% left
8. with itunes working
9. Not problem with Sync Contacts,apps etc.
I dont now why, but 2g sound is less quality in earphones(too more bass and sound is hrr-hrr-hrr

) My 3G playing perfectly in this earphones.
In general:I am satisfied nearly completely.