I useTi Backup myself, with no problems at all.
I regularly use Froyocreamsandwich, CM7, CM9 and once in a blue moon, stock. No problems. Just be very careful which apps you restore data from (if any).
You'll find several here that think it causes problems, but you just have to be selective.
I also use AppExtractor, to restore wifi/bt settings, SMS/mms, call logs etc from Nandroid backups. It can also just extract .apk files from your Nandroids. Also be careful with that, between froyo and CM7 based stuff.