Reason why you should buy a Rapid.
They are simple to work on.

Reason why you should not buy a Rapid.
They are simple to work on, so every man and possibly his dog too have had a go at "improving" it. Finding an unmolested one is hard. Finding an unmolested one in legal limits seems to be harder, I speak from experience here, bought a later model mark 1 with anti tamper on that was running at 14 ft lb with the anti tamper block still in place!