I'm told these are really good and the midi is especially quickI have looked into the 2box, but found it not zen-friendly.
I believe these are reasonable too
One significant issue with the 2box is the HH settings. The default HH setting is open, not closed as you find with Roland, Yamaha or Alesis. so there's no way of getting a closed HH sound association with a trigger as you have to send the note and CC message simultaneously - which the Zendrum can't do.
There is a way around this, but it involves editing the HH samples in every kit - no universal setting.