I have used one 3 times, but Dave Washbrook did sell his back to Alltec because it wasn't as fast or leave the hard floor as dry as his Sx12 and that is fact you can call him.
If you listen to what people have to say you can quite easily work out what is good or what is right for you, I have been in this industry for over 20 years cleaned well over £1million of soft furnishings and have bought loads of cleaning equipment which wasn't fit for the purpose I wanted it for so you could say by passing on my experiences to others that I can save them time and money.
Whether you take my advice or not I don't care but after being regularly on the forums for 10 years I can always recall posts threads and actual conversations what you do with the information is up to you.
Shaun