Get an Airflex Pro or Storm, best machines on the market, and a doddle to replace parts on. Where are you based? If you buy an Airflex from the manufacturer, Cleansmart in Nottingham, and do your training with Derek their instructor, you get the course for free. If you live north east area, you could go to John Kelly at Restormate, he does occasional training courses. Both are very good , John is also an agent for the Airflex machines.