Here's my $0.02
I was really drawn to the SCTs, bought one, built it up and have run it quite a bit. I have driven many others as well. Here is my conclusion on the vehicle type (speaking almost exclusively of 4x4 SCTs).
-They are a bit more durable than other 1/10 scales, owing primarily to the very protective bumpers & body.
-They are not really 1/10 scale
-They are fun to bash with, but far less graceful on a track
-The bodies act like parachutes, making them decend far slower and with far less grace than buggies or stadium trucks.
-Though tougher than most other 1/10 stuff, they are 1/8 buggy size with near-1/8 buggy weight, but basically 1/10 scale sized drivetrain and suspension parts. In other words, they are nowhere near as durable as a 1/8 buggy.
-The added size and weight make a lot of 1/10 scale engines or motors/ESCs inadequate; a 540 can and corressponding 1/10 ESC has to work a lot harder on a 6 pound SCT than a 3-4 pound buggy or stadium truck.
-The 2WD SCTs are little more than a stadium truck with SCT body and bumpers.
Summary:
Having had my fun with it, I'm pretty much over them. At least as they are from manufacturers. In 2WD, I'd rather have the lighter weight and more graceful stadium truck chassis. In 4WD, I prefer a 1/8 buggy.
I am building a new SCT, but it is nothing more than an e-converted 1/8 buggy with 1/10 SCT body and bumpers. Much, much tougher.
If you're going to race SCT class, then you need an SCT that meets the requirements (a converted 1/8 buggy is a tad wide and overweight). Otherwise, I'd personally suggest something like the OFNA Ultra LX2e, and if you're really sold on the SCT, then just add the body & bumpers. Or buy a 1/8 SCT; they are slightly larger than the 1/10 scales, but built on 1/8 truggy platforms, so quite tough.