Re: Guitar (Stick) to MIDI interface
I think the Axon is great! I was using it with my guitar (with the Graphtech Ghost pickups) to trigger a Korg Triton rack synth. The tracking was phenomenal. I had hoped to one day use it with my stick, but I wasn't able to find a way to implement the Ghost pickups into the stick. See http://www.stickist.com/viewtopic.php?f=4&t=2340
I have heard that the roland gk pickups work well with the axon, but I don't have any experience with that combination. I have tried the GK along with a roland gr-33 (on guitar) and the lag was horrible. Nothing compares to the Axon, in my experience.
That being said, I think it also matters what kind of pickup you're using for the midi - magnetic or hexaphonic piezo. I think there's a big difference between the Roland GK vs the Graphtech Ghost piezo saddle pickups. You get a much faster response with piezos and a midi preamp (Graphtech Hexpander).
Just my 2 cents. Your mileage may vary.