The pulser arrived today - neat little gadget, need to buy a box for it.
I didn't try the trigger out or USB connectivity yet, just a simple test with my WaveRunner 6100A. 50 Ohm termination, RIS mode (i.e. equivalent sampling, in real time it is 10-15 ps worse), the rise time is around 240 ps, well under the datasheet specification of 300 ps.