Boss VF-1 Effect Processor

The SE-70 was approx. 4 1/2 years old when the VF-1 hit the market.
I don't expect Boss to come out with a newer version soon. I have no 
personal experiences with the GT-6 but I've read a lot about this unit   
and the amp modeling thing seems to be improved in comparison with the 
older GT-3 and VF-1. The biggest advantage of the GT-series is that 
you don't need a MIDI foot controller to change patches or parameters. 
If you already have one, well.... On the other hand the VF-1 is more 
flexible in combining several modulation effects. You can't have Pitch 
shifer, Phaser, Tremolo, Ring Mod at the same time with the GT-6. With 
the VF-1 that is indeed possible (keyboard algorithm).