Let me shed a little more light here as I'm the one that sold him the Flashpro.
1) The tunes are transferrable in that it is locked to the Flashpro serial number and not the VIN. The OP paid $600 for the FP (which I thought was a fair price considering what I see them sell for on here) and it...
I have a brand new Milltek that you'd be hard pressed to tell the difference of in terms of performance. Build quality is also substantially better than RV6 and easily on par with the other two.