Hello Joe
If it helps we bought a megaspin 400 recently from hofmann megaplan.

http://www.hofmann-megaplan.co.uk/

is a great bit of kit, and we were advised not to waste money on the weight wizard by them.

It does what it says on the can and is easy to use, you can also hide weights behind spokes on ally wheels, the team at hofmann are very good at their job and very keen on price, with a good backup for advice and teething problems in our case operator not machine, overall a very good buying experience

ATB
Nev