I redid my Dad's 1986 Jaguar with colorplus.com (tan color). The seats were heavily worn and cracked. The process is very, very time consuming (actually more waiting in between steps than anything). But if you take your time and do it right the finished product is great! You cut a 1" sq piece from the bottom of the seat, etc and send it to them and they do an exact color match. These seats were in BAD shape and now look new (well say 95%). 8 months latter the seats are holding up very well, but a few very, very small stress lines have shown up again.
Here is some pics of a BMW M5 that the guy used leatherique (similar to ColorPlus)
http://home.insightbb.com/~todd.kenyon/leather.htm