I don't know what the Enforcer is like to maintain internally but after having a Scorpion for a long time i would suggest the Jag is not the best option if you intend to swap out vac motors and service the water pump yourself. Having to take off both tanks and non quick release hoses for the pump is a real hassle when it comes to it.
In my opinion the way the Airflex is designed to access the internals it makes it head and above the others for ease of user friendly self servicing and maintenance. It also has lots of options to keep in budget and have what you want onboard. To swap a pump or pump head on one is less than an hours job even for me with clumsy fingers and when you need to do it you will be glad of the way the machine is designed.
It also empties all the water from the dirty tank - it doesn't keep about 5 litres of dirty stinky water in that you have to empty with a bung on the side like the Jag - which isn't easy especially if you van mount it. And that does make a big difference on the amount of times you have to dump water during a job and is just really bad engineering. Even a donkey years old Ninja machine is designed to be able to dump all the water in one go! Yes you can have auto dump, but from what i can see the one on the Jag can clog and takes a load more maintenance all over again to keep it going and you really don't need that failing if you have the machine on the van and are relying on it dumping water when you can't see it. I think the auto dump on the Airflex and Enforcer are much better but i haven't seen them.
The 8.4 vacs look good but will make no real difference in comparison to 2x 6.6 motors or 3x 5.7's on every day use.
Think about the machine in the long term and day to day workings, not just whats on paper for the specs. Its that which counts not the sales pitch when you initially buy.
