Lately, I've been spending a lot of time at APD as I've noticed they have a lot of loop based libraries for Kontakt (yes, I'm too lazy in doing my own backing tracks ) which are really made well i.e. Riffendium, Barrage/Tranzform, Synferno etc... Just installed Synferno yesterday, and love it!!
Of course, I got them all on a sale price and now I'll have to check this latest offering....huge library it is and haven't used anything from Ueberschall (yet).