I was wanting to get the GT-8 initially but it's out of my budget. So i got the korg ax3000g after hearing and seeing so many good reviews and feedbacks on it's sibling ax1500g.
The first thing i notice is the big lcd panel that is brightly lid and easy to read even if you're standing. But it won't be that visible under the sun or bright day. Like it's sibling, it's very user friendly. Starting with effects edit section, the effect category buttons like Pre FX, DRIVE/AMP MODEL, Modulation, Delay and Reverb, the button LED will be lit if an effect is on, blinking while that effect is being edited, or dark if that effect is turn off. Select one the effect you want and move down to the parameter edit section to adjust the parameter of the effect. The LED will lit to indicate the knobs that are currently active.
Effect Types
Pre Effect (11 types):
COMP, PICKUP, ACOUSTIC, VOX WAH, AUTO WAH, U-VIBE/PHASE, CHORUS/FLANGER, OCTAVE, RING MOD, DRONE, SYNTH
DRIVE/AMP MODEL (16 types):
TUBE OD, BOUTIQUE OD, FAT DIST, ORANGE DIST, METAL DIST, SHRED DIST, FUZZ, OCTAFUZZ, BOUTIQUE CL, BLACK 2x12, AC15, AC30TB, UK 68P, UK '80S, UK MODERN, US MODERN
Modulation Effect (11 types):
CLASSIC CHORUS, MULTI TAP CHORUS, CLASSIC FLANGER, BI CHORUS, DUO PHASE, TEXTREM, ROTARY, PITCH SHIFTER, RANDOM STEP FILTER, FILTRON, TALK MOD
Delay Effect (11 types):
ECHO PLUS, MULTI HEAD, ANALOG DELAY, MOD DELAY, SWEEP DELAY, 2TAP DELAY, CROSS DELAY, RHYTHM DELAY, HOLD DELAY, REVERSE DELAY, FREEZ
Reverb Effect (11 types):
SLAP, SPRING, BOUNCE, PLATE, GARAGE, CHAMBER, CANYON, ROOM, STUDIO, HALL, ARENA
CABINET MODEL (11 types):
TWEED 1x8, TWEED 1x12, TWEED 4x10, BLACK 2x10, BLACK 2x12, VOX AC15TBX, VOX AC30TBX, VOX AD120VTX, UK H30 4x12, UK T75 4x12, US V30 4x12
I'll update this reply when i got more time ^^;