It just came out. You would definitely want to give it some time to settle. Run all your connected apps at least once, do a couple battery pulls, let it index all your media and files. It takes a few days before it will level out.
If you want to go back, just run a device wipe, then run the auto-loader for 1767. You'll notice poor battery on that too for the first few days while it settles as well.
If you do go backwards and use restore, you will need to modify the backup or it won't load. Be prepared.
Is there a guide out there for modifying the backup files for backward compatibility?
I would LOVE if BB Link would be more like Desktop Manager and let you select specific things like gamesaves, texts, contacts, whatever only in a back up :\
But i fell that the 67 is better then 91 with the same apps on phone.
But what is about the leaks 10.2.1. XX ?
10.2.1 builds are early in their cycle. If you want more solid than bleeding edge, stick with 10.2.0 for now, until 10.2.1 hits into the 4 digit build numbers.