I posted because the comments that you got were not as good as I felt the VG Systems are. I have owned and played the Roland GR-1, GR-9, VG-8, VG-88, and VG-99 (and the older shadow pickup system midi controller). I also own the Axe-FX Ultra (and have owned and used ADA MP1 pre-amp, Mesa Triaxis, Line 6 AX-2, Roland JC 120, Peavey Bandit, Marshalls, several computer amp simulators, etc).
I have never had a problem with the Roland GK pickups or the Roland Ready strat pickups.
Nylon sounds are not too good.
My opinions:
Roland VG-8
I loved it. Still own it. It can do sounds that no other processor that I know of can do. As far as the amp sims: some are good, some I don't care for. Most of it is in your fingers. I used the VG-8 into the amps that I played. So, I used the distortions and cleans of the amps and used the VGs as effects units. I love sounds & I get bored easily, so I like to add synth sounds at times. The VG-8 also has a Carlos sound that every guitarist that I have ever jammed with turned around & was amazed at the tone & sustain.
Roland VG-88
I got it & sold it 2 weeks later. I felt that it was a step back from the VG-8.
Roland VG-99
I use it now. The alt tunings are better than the VG-8 in that there are less harmonic overtones that sometimes sound out on the VG-8. The amp sims are better than the VG-8. The acoustics are way better than the VG-8. I mainly got it for the midi controller aspects. I use the VG-99 to control a Roland JV-1080 and they go into the AXE FX Loop. (The VG-99 has a built in mixer so I can send just the guitars pickups to the AXE FX Loop, or the VG-99 sounds to the AXE FX LOOP, or the VG-99 controlled JV-1080 sounds to the Axe FX Loop. All works great & I love the mixer aspects of the AXE & VG-99.) Overall, the synth sounds of the VG-99 are not as good as the VG-8. Also, you can reverse mount the GK pickup if you need to.
AXE-FX:
Great effects, great mixing, great updates & support, it can be a beast to fine tune. Most of the patches that I download are either harsh, brittle or piercing. Some even max out the ultra & I get clicking (so I am not sure how others can use the same preset). I like the AXE. It does take time to program it. The VGs seem to be quicker to get a useable tone for me. I control all with the Liquid Foot Pro.