Andy
The Excel was a very easy machine to set up and robust. The only problems i had with it was the water pump burnng out on the end, which was remedied with a micro switch from a washing machine shop at £3, and on one occasion i accidentally got water in the vac motor somehow and blew it.
If you look after the vac motors and change the bearings it apparantly prolongs its life. I think the problem is when the bearing starts wearing out, it allows the armature to revolve too closely to the windings and then it's too late. Its also a pig of a job to change them and involves removing the bottom plate after tipping the machine on its side. I know you can have them regularly serviced but when you are self employed you always want to save a bit of money.
A lot of the time, i ran the machine with the heater turned on which didn't seem to do it no harm at all. The only downside of a portable is that on several occasions i would get to a customers house and their water was cold. I would end up waiting then for it to warm up. However i went to do a rental property the other week and there was neither hot water nor electricity on and as i couldn't run the truck mount at this property i had to ask next door. The hide a hose handtools are okay, but when they block up with fluff and are a bit awkward to clear out as it wraps around the solution pipe. The prochem version is much better as you have a soft collar that you can slip off to clear any obsructions as can you disconnect the solution pipe at the head of the tool.
I think if i had my time again i would definately had bought a van straight away and ran the machine from the vehicle. This would have saved the machine from a lot of wear and tear. I would definately buy one again, but there are also some good ones from Alltec where you can remove the motor pack to lower the weight should you need to lift it up stairs etc. With the Prochem ones, the tank part drops forward for easy maintenance. It's horses for courses as they say. You pays your money and takes your chances.
Dave