cascam I have had a number of tools like this in the past, but in my experience chinese clones will let you down with later ecu's and it will cost you a small fortune to fix. Also chinese stuff comes with virus like win32sality. After much searching I have found a place that sells EU quality clones, and I would say they are the best on the net. Price is much higher than the chinese stuff but quality is like original tool.
look for
www.car-prog.comIf you dont mind taking the risk with chinese then for the price its hard to complain until it bricks a tricore ecu.
just my thoughts