I suppose you have to take his word for it that it all works as it should (or not).
Bit of a leap of faith. As far as I know, you can't really properly test it easily, only perhaps an indication that something is happening on lockup. The diagonal X and front-rear H design differences, between FWD and RWD designs worry me.
You could ask Tom for some proof that it actually works as it should for almost 550 quid I would think!
En passant, ... did you ever get that report, Geoff?
David