Not to threadjack, but my GP JB went fine (after I dealt w/ a few issues that were caused by the 4.1 firmware I downloaded). I have noticed that Cydia seems buggy now... It will take forever to load (says "loading packages" forever at the top, then I will occasionally get an "Error refreshing data - failed to fetch" message).
When I click "changes", I will often see no updates to my DL'd packages (which could be because there are none), and it will take quite a while to load then as well. Anyone having buggy/slow Cydia issues on JP or LR?