At one time the XK system was the gold standard of digital clones. That was several years ago. There are better clones now that are actually less expensive. I would look at the Hammond SK2. The C/V, percussion and digital leslie emulation far exceed the XK system. The most realistic one, IMHO, is the Crumar Mojo. Not only are the SK2 and the Mojo better sounding and more realistic, they weigh much less.