thinking of buying new or second hand?
If new, then there is, in my opinion, better value machines in the market place.
Extracta use big (physically) vac motors 7.5" I think they are.
A few users have had problems with failure of these at too frequent intervals and they are a lot more to replace then the 5.7" motors which are just as effective or maybe better.
If you have the right budget there is a new machine imminent, the Jaguar, from established supplier.
Yhat would be a good buy.
Its release on the market will mean a few 2nd hand machines will be released including the 3 vac Scorpion (there are 1 or 2 going 2nd hand now).