Well OP, you are in luck. I currently own a SC California Sea Mist Fastback. It's the second one that I have owned. I first bought one late last summer but by December decided that I could get something better so I sold it. Fast forward to March of 2013 and I realized that I should have kept it so I bought another one. I use in a rotation of putters that I currently use (SC Cali Fastback, SC Limited Release Golo N5, and SC Newport Prototype Circle T).
What I like about the Fastback is the fact that there is no knuckle, and thus the shaft goes right into the putter head. This means that it's more face balanced usually than a putter that has a plumbers neck or knuckle. I've owned quite a few Scotty's and the thing about the sea mist line, especially the fastback is that it has kind of an "acquired taste" when talking about the feel of the putter. The putter is a tad heavy and has a pingy sound that some do not like (this is compared to the select line of SC putters which while also having deep milled faces, does not have the pingy sound and has a bit of a softer feel). Thus I'd say that the Cali Fastback is a good putter but does not have as soft of a feel as the putters from the Select Line.
Unlike the Studio Select, the California line is deep milled. So in comparison of the Studio Select, California Sea Mist, and the Select line of putters, I'd say that the Sea Mist has the "hardest" feel out of the the three while the Studio Select is probably the softest, but is not deep milled like the Select and Sea Mist Lines.
Another thing I like about the Cali Fastback is that while it's more than a blade, it's not a huge mallet either. It's size seems a very good fit for someone like me that wants a fairly face balanced putter but does not want to be putting with a brick either. I will caution you to make sure that you are okay with the more solid feel of the putter and the pingy-ness of the Cali Fastback. The putter is a tad heavier it seems and balls definitely roll out further with the Cali Fastback. Thus if you looking for a putter that as long as you get the ball on the right line will have plenty of roll out to help with speed issues, then I think the Cali Fastback is a great fit. If however you are very precise with your lines and do not have issues with speed then I would say that the Cali Fastback may not be the best choice then.
Sorry for such a long post but you were seeking feedback and I learned the hard way (I had to buy the putter twice) so I figured that I would share. Since I am also a collector of Cameron's and have owed more than 20 of them in less than a year, I have had the chance to figure out the pro's and cons of many of the putters. Hope this helps. Let us know what you decide and how it works out!