I bought this kit (although not through Amazon) and am very disappointed. There is a problem with the 'brain' module that means that beats are missed when hitting the snare. If the kick, snare and hi-hat are played together, the snare beat often does not register. If you play quick single strokes, triples etc on the snare, maybe 60-70% will register.
At first I though it was a fault with the snare pressure pad, so I switched the snare for one of the tom pads - same problem.
The snare volume is also very quiet - although this is an easier problem to solve.
In addition, the crash cymbal ofter registers two hits, or registers the second sound when hit - not a huge problem but would get annoying.
Type 'DM6 problem' into Google and read the results. This kit, in my opinion, is not fit for purpose and should not be sold until the problem is fixed.
It's a shame, because the rest of the kit is pretty good.