Well, decided to take a chance and ordered a 500x. I loaded my primary patch from my 500. I currently run 2 copies of the same patch, one having a dr z, one a %13. FS1 is midi assigned to swap between the 2, more or less acting as a amp channel switch with the other 7 FS' just being a pedalboard. The only problem is that when I swap I lose the current status of my "pedalboard".
I'd hoped the 500x would allow me to do nothing more than turn on a second amp but, no luck.
The preset is Wah> Compressor> Drive pedal> amp> Tremolo> Rotary cab> Delay
Oh well, brighter LCD, hopefully easier to see LED's. Guess I'm going to stick with the 500x being my pedalboard and running stereo amps with EQ's post amp on my HD Pro.
Hope this can help anyone running similar size presets decide whether an upgrade is worth while for them.