I use these on my practice kit with mesh heads. They trigger quite accurately, much better than the Roland ones I have previously used.
I do however use a twin trigger DDrum unit on my snare and also timbale so i can get a different sound from the rims. I am connected through an Alesis trigger box to a laptop running Toon track Superior drummer.
I have also tried triggering on a live kit using an alesis sample rack, but find they do deaden the live sound a lot on snare and toms, but it's much less noticeable on the kick drum, which means I can get a great loud sampled kick without any possibility of dreadful low end feedback.