I'm still running trusty 3.1.2 JB on my 3GS. It is worth upgrading to 4.1? For what reason?? Thanks!
If you don't require apps that needed the later version, you can stick with 3.1.2 for now. It is just people like to join the party of jailbreaking at newer firmware.
With Cydia server crashing all day, today would not be a good day to try imho.
Forum Rules