I had a GNX4 for over a year. It was pretty cool. Had alot of stuff incorporated into it like drum machine, 8 track recording, edit patches via USB. I recently sold it and bought the BOSS GT-8. It is a better effects unit IMHO. I like the dynamic picking effect on the BOSS and the harmonizer is cool too. I think the BOSS has a better tone, not so digitized. Every pedal on the BOSS can be programmed to control about every paramater on the unit. HA, I said UNIT> :rolleyes: