I'm better for it and I prefer to keep things simple and see what sounds I can get out of my head and hands rather than relying on a sound that someone else created.
If I'm playing a violin thing, for instance, I tend to respond to that sound with the way I finger.
If the guitar synthesizer is really going to stand as a synthesizer on its own, it needs to develop a more characteristic sound; I don' think it's gotten there yet.
The most obvious thing you can't do with a guitar synthesizer is to really sound like a guitar.
My favorite sounds are the high, spacey ones that are very ambient.