Just got one of these for AutoCrossing, and put it to the test on Sunday at our first event of the season.
Here's the website. http://www.cg-lock.com/index.html
I just ordered directly from them online, though you can find them at other suppliers if you search.
But, with their free shipping offer this month, it was more economical to get it from them anyway.
Worked very well if I do say so myself.
The added restraint and resultant control of the car is very noticable.
I'm not ready to slap in a full race harness at the moment, so this was a great alternative.
Install took about 3 minutes.
I've been driving with it back and forth to work, but I finally took it back off last night.
It was just a bit awkward to use for everday driving, even with the lock-clip removed.
Mainly, the extra weight won't let the belt retract quickly enough when you take it off.
I kept whacking the door and window with it.
No problem, as I mentioned, it installs quickly.
Any questions, just ask.
IMHO, well worth it.