I saw/ briefly used one Inna recent training course I attended. It looks a decent machine to be fair,though the one on demo was the basic model, the dual 6.6 heated model looks fantastic value. Yes it's a rebuild Sandia or whatever they are, but alltec use this design and have done as long as I've been carpet cleaning ,and so have airflex on thier mini machines and the design seems more then good enough.
Think about what your after in a new machine and weigh up what it offers.It does seem very good value though