NGL, I'm still considering picking up the GX10 or GX100 to mess around with in front of (or 4CM) my Orange amp. The GX100 is tempting here because it has lots of switches, has the expression pedal built in, and has an amp switching jack built in. I didn't like the GTK for stereo effects and lack of delays, but I'd run the GX in mono and it doesn't have the same fixed blocks. Also curious how the Boss amp models sound running into a power amp and cab (which I didn't try previously as I got the Orange amp and cab after I sold the GTK).