VTL 450 Signature and Soundlab A1

Hi Guys,

I'm looking at a pair of these VTL amps, and I understand that there have been a number of updates in the last 5 years. The fella selling them says they're around 3 years old and have balanced inputs. Any info you can provide that will help me know what to look for would be a service.

By the way, I have Soundlab A1's; if anyone can comment on this amps compatibility as well?

Thanks!