My overall take on guitar synths is that they can be fun, but, utimately, I never wanted to sink big money into them, because at the end of the day, its (IMO) a less than ideal input method.
Its like using a keyboard/sampler for guitar sounds.... sure there are tons of sample libraries, phrase samplers stuff etc. I've got the whole collection of the NI stuff, the funk, the strummed acoustic stuff, lots of libraries that have all these little licks and lead parts you can trigger, controller keys to change fingering, round robin sample stuff for repeated notes etc, but even with all that, even with a great midi keyboard, it is still far easier to just play it on a guitar.
Likewise, I find it so much easier to play keyboard parts on a........ wait for it... keyboard. Simple chords, basic left hand bass lines with right hand accompaniment etc is a piece of cake with a piano keyboard, but its next to impossible to finger that same stuff on a guitar neck. Now, sometimes that can be cool, you can come up with some different stuff, but usually at the end of the day, I prefer a midi style controller.
That might mean using things like pads or a iPad interface, Ableton Push etc, which I can quickly assign to a given scale, now each and every key is in scale, you can't hit a "wrong" note..... Makes it so simple to play in some parts even without knowing how to play piano.
Guitar synths, synth pedals, you name it, all well and good. I do enjoy Jam Origins stuff, I like my old EHX synth pedal etc, but at the end of the day, I often have to ask myself "why?"
Why do I want to go through a ton of effort to play what usually comes out to be a poorly tracked bassline on my guitar, when I've got like a dozen other controllers, ranging from cheap little usb midi controllers, ipad virtual keys and pads, etc right up a hammer weighted 88 key controllers all of which work so much easier to playing a simple bassline, and that can do so without any issues with tracking etc. I can have total control of legato, pitch bend etc, every note input triggers the correct pitch, no glitches etc
Sometimes I just have to step back and and ask myself is making a generic filtered bass sound (with glitches et al) really something I need to do ?
I pursue it because I enjoy the pursuit of it, trying to figure out how I can do it, seeing what new tools are out and if they are any better than the old stuff, etc, but am I actually doing it out of need, or just because I can try, and if/when I get those tones, do I really see myself making use of them in my music.... hmmmm...