Hartge diesel tuning?

[DJFish]

Anyone had any experience of Hartge tuning boxes?
I've the chance of picking one up fairly cheaply secondhand for my 330d(180bhp), boosts power to about 225bhp with a decent torque increase as well.
Apparently it's warranty friendly and fully T.U.V approved, just wondering how easy it'd be to fit and whether any other work would be involved.

Dave