I have a Roland GI20 and am not impressed by the performances. I have a Ghost pickup system , ( the piezo sound is wounderful by the way) driving my laptop. I read a couple of reviews of people saying that the Axon system is much better. I recorded the audio out of my GI20 and a MIDI track to see the latency. With the buffer size to 128 ( Mac ) there is a delay of 6210 samples at 44.1Khz. (Open low B) Went to a store to try the AX 50. Recorded the audio out of the unit and also a MIDI track , same low B , gave 5966 samples (44.1Khz ) That a difference of 244 samples faster (0,55 % over one second ) That's not what I call "a lot faster" for 200 bucks more....... We're still not there yet for "live" applications for the bss guitar , OK for pads but if you need a tight bass synth sound , learn the keyboard!