I think the Circle T putters are a lot different.  In my opinion several of the options / metals that are available are a lot softer than the retail putters.  Not to mention all the cool stamps that are out there that are not available in the custom shop.  I also think the lines on many of the tour putters are a little softer.  There seems to be some pretty unique things done to many of the tour putters.  I'm sure some of the more in touch CT guys could elaborate much better.  Are they worth the money?  Probably not, but they sure are cool.

Regarding Circle T's, the metals are all different. You have the 009's, GSS's, SSS's, and many different finishes as well. Usually they are very soft and have excellent feel compared to the OTR putters. You might note the different millings. I am fortunate to own 2  and in the right hands and right course conditions, they are true tools in performing well. Stamps are just a fun extra you can add and play around with if you are in contact with Scotty's tour department.