I received my Trapkat 5Ks three weeks ago.
I purchased this controller because I wanted a midi kit that was compact and easy to move around. I have played with electronic drums and triggers for many years, my first being the Roland DDR-30 with MKS-70 and MKS-80 pads. I have made my own controllers and pads over the years, even a drumitar like Future Man's.
The bottom line............. I have always wanted a Zendrum & a Trapkat.
I have only managed to spend a few hours with it, mostly programing kits in Superior Drummer, EZ Drummer and BFD2. I like how that pads feel and play and I really like the size of the unit.
I have to say that it is this drummers opinion that the onboard Kurzweil drum kit sounds are sub-standard. It is my belief my old Alesis D4 and DM-Pro sounds are better. It is also my opinion that the onboard drum kit sounds cannot touch Superior, EZ Drummer or BFD2 kit sounds. The onboard sounds will do in a pinch, this will enable me to leave behind my rack modules as back-ups and lighten my load. My current onboard favourite is the Birch Kit. There is potential with some of the onboard percussion sounds, I haven't really had a chance to go there yet.
I will spend more time with it over the coming months and will try to post my progress.