I have the Turbo.
I run the machine from the van mostly using 2" hose and 1.5" whip to fit tools. It's weight is not too bad but confess I made a ramp for those occasions it needs to come out.
600 psi but i've not really needed to run any higher than 350, and that was on really bad black top. 200-250 is ample for domestics. Recovery is excellent. You need to prime the pump before use and I suggest an in-line shut off valve as on long hose runs it's a pain nipping back to the machine to back off the pressure to switch tools. Compared to my twin vac they are worlds apart as you would expect. If you don't want to run from the van you will never need to take it indoors and the pump is consistent even over long hose runs. There is also a blanked port to add a 4th vac.
Moves around really well, nice big back wheels and the front has a brake on it. Controls are all on the top so no bending. Nice exhaust silencer accessory which really does work and quietens the machine, I don't use it that much but it's good to have.
Once a week out of habit I open it up, i've always done this on other machines and this has got to be the easiest. Two bolts and the top flips forward. Set the brake and lean it open against the wall. The vacs are all housed on a flip panel, simple and easy. I give it a wipe round check for leaks etc, no problems so far.
Build quality is excellent and it is really well designed, looks a bit different I suppose but that was one of the reasons I brought it and the fact it's UK built.
I rinse the pump with cold water if I've had anything in the tank after every job and because the the shape of the recovery tank is round there aren't any corner for crap to get stuck in. I don't suck excess water out of the solution tank. I use the priming hose directed into the recovery tank to rinse out and flush all the grit and then wipe dry. It's as clean as the day I got it. If you're using detergents or high foam chems i'd use a defoamer, I use splitters and never had an issue but still use a little diluted in water and pulled through the hose. I run the vacs for 10 mins after use to dry any moisture out as I pack away.
I was really concerned at the lack of heat on board. The Alltec gets around this using the 3rd vac switch to keep it to 2 cables but in the end decided to get the in-line heater, but there was a delay so I had to wait for it. Have to say I have not missed it at all. Tap hot has been sufficient so you won't have to have one, but now they are available and adjustable I will get one once i've had a chance to try it as I don't prefer cold water extraction and there is bound to be times when that's all that's available.
The real question is would I buy it again and the answer is yes. Nottingham is around 130 miles but anything I need I can order for next day and I could use my back up Alltec if necessary, so keep the Ninja if you can. Parts are all common and any competent engineer should be able to do any work, and if your minded to tinkering I'm sure you could do it. Like anything it will need to be serviced. I have found Matt at Cleansmart to be really helpful and I now order most of my stuff from them as the service is excellent and I'm sure he would welcome a visit so you can try it out. Dibs to Chemspec direct and Restormate too.
So a good performer, easy to move around, well designed and built. It made my decision easy but I should say the Alltec triple is drop dead lovely and equally well thought out and the Scorpion is legendary. All will serve you well.
Simon