I got Fibrenew to do some touch up on the my seats. I have the white leather seats which are a complete pain to keep clean and they seem to scuff really easily. I am overall happy with the work these guys do, generally seemed super detailed. I got both my seats touched up quite extensively with scuffs and wear on both seats and parts getting re-dyed. Cost was $200, guy was here from 11am - 2 though.
Here one example of a before and after of the driver side left bolster. (I apologize if my photos or links are crap)