I found the DM5 Pro Kit to be very easy to setup and found the module to be quite easy to get to grips with. The frame is sturdy, and has presented no problems to me so far, (and I have not always been gentle with it!) It took only a couple of days before I felt comfortable with the module. It is packed with a variety of sounds, and you can configure a set from the custom sounds or play straight off the bat with one of the well balanced presets.
The kit itself has relatively realistic feeling heads. They are no substitute for real skins, but for that in an electronic kit you would be looking at several thousand pounds, so for the price they are excellent.
Furthermore, they have a response accuracy I had never anticipated, and it can be adjusted to suit your play style. You can also adjust the decay, pitch and volume of each trigger.
The dual-zone snare is a significant bonus, which I have had programmed as a ride bell, a snare rim, or a second crash. The ability to choose greatly expands the possibilities with this kit, and the module allows for 3 more trigger systems to be hooked up.
The one grief I do have with this kit, is that the sound of the stick hitting the surfaces is quite loud, particularly on the dual-zone pad which when played aggressively makes a sound of wood hitting hard plastic. However, this is by no means a big problem, just something to bear in mind if you had planned to play them at night but didn't want to annoy the neighbours. They are still, of course, significantly quieter should you wish them to be, than their acoustic counterparts.
I would recommend this kit over others in a similar bracket due to the possiblity of expansion that this particular kit allows. A friend of mine purchased the Traps E450 kit, and he experienced problems with double triggering, and found that the kit wasn't very resilient at all.
Ultimately, my only grievance with the kit is one that is easily resolved. If you like playing your drums at some volume, your probably won't even notice. If you play your drums with headphones on, you probably won't notice. The value for money is incredible, and for those not wishing to spend £1000+, I believe this is the best choice.