also the VG-8 has 260 patches in all , while a GT-3 or GT-6 has 340 patches ....
But what makes the VG-8 more expensive i think is that :
'All effects are available simultaneously' .
This is killer compared to any other unit, bec all units have a range between 6 & 15 effect available simultaneously ..
e.g. the GT-3 has a max of 13 effects simultaneously , which means that some of the effects won't work together , so you cant have a flanger and phaser, harmonizer & vibrato at the same time, which kinda suck , but i usualy dont need more than 6 or 7 effects simultaneously ... but just imagine what can you do if you have all of these effects available at once !!