Got one and not living with it very well.
Fitting was a pain as I had to overcome an issue with the spring in the lock mechanism, the following week Simon rushed out a modified part as others had complained about the same thing.
Is ok to use, no key required to lock it and just a turn of the key to unlock it (same as my old Clutch Claw) but I still can't get used to feeling the hinge under my feet. When locked it is about as secure as anything can be, it covers all the pedals but is no easier to use and at least with the CC removed the floor is clear.
There are no rattles to worry about as your feet rest on the main section and the top part which contains the lock is held in position when not in use by a turn-buckle.
Not too keen on the shear-nuts underneath mainly due to the fact that I am taking the floor up next year to have the bulkhead galvanised, I prefer to use a single length of bar which is drilled to match the pedal lock fixings and then tapped so the bolts can be screwed in from the vehicle interior. The bolts can't be accessed from the interior with the lock in position and being a single piece of steel you can't unscrew it from the underside.