I am not suggesting that you need to rush out and change all your hoses and wand. The Airflex will work very well with your current set up. However if you were buying a new one I would definitely recommend going with 2 inch from the start. There is however a downside to 2 inch hose - it is much more difficult to handle on site etc.
Nigel
Maybe that is what Matt was saying.
James, your machine will do a very good job with 1.5" hoses, but like Nigel and Simon have said - a 2" hose will do better.
However, like Nigel says no need to rush out to spend your money, you ARE going to get a good job done with 1.5, just that 2" is better.
When I change my Scorpion over from 1.5 to 2" some 2.5 years ago the difference in performance was very noticeable.
I kept my 1.5" wand (just need a 2"-1.5" reducer) and I have the first 10' at the wand end 1.5" - more flexible when you are in a tight bedroom etc.
I mentioned flexibility of hose. The 2" tend to be less flexible - thats why I have 10' of 1.5" at the wand. Solutions Cornwall did a less rigid 2" hose - certainly easier to work with in the house and definately easier to coil up for your van. Dont know whether they still do this hose - check it out.
For customer service I rank Solutions Cornwall, Restormate and Cleansmart all top notch.
I have personal experience with all three.
Others that do or may get mentioned - I cannot comment on as I have no experiance with them.