I haven't tried those, but I think they're a bit of gimmick. I'd much rather use traktor Dj or ableton live or some other soft sampler for this. If it's just simple triggering of samples without a need for beatmatching, any freeware sampler will be fine.... hehe even an ipod.
Another method, dir, if you've got a video suite that supports markers and a jump to markers option, just lay out the samples on the timeline and jump to it when needed.