Originally Posted by Gharedd
Can the midi pick up be installed easily into the guitar, so you don't have to have that big ugly thing on the front of your guitar?
Yes - though "easily" is perhaps pushing it, it's a fair bit of work. Here's a closeup of my RG570, with a Sustainiac Stealth and an internal GK-2. Apart from having to cut the pickup mounting ring slightly it's a pretty neat installation, and I understand that you don't have to cut the ring on a JEM. There's a slight fisheye effect from the camera lens - everything is straight on the guitar, honest!
And a rear-view so you can see how much gubbins needs fitting (plus the extra cavity for the Sustainiac pcb and battery):
I've played a midi guitar once in college, and if you bent the string it sould move to the next note. Is this so using the Roland GK pickup and Roland VG-88 or is it more complex than that?
The VG isn't a MIDI system. The simplest way to think of it is that it is a multiFX unit that can work on each string independantly. This allows it to take the signal from the GK pickup, whatever guitar it's fitted to, and produce Strat-like, LP-like and similar sounds. It also models nylon strung guitars, acoustics, 12-strings, alternate tunings, basses, some synthy noises, Rickenbackers, Dobros, Teles and lots more that I've forgotten.
All of your playing technique comes through perfectly - there's no lag, no tracking problems, no mis-triggered notes, because it doesn't do pitch detection, it works directly on the signal from the GK pickup.
It also has some very good amp simulations and a decent FX section.