How does the bass perform as a standalone instrument without the synth? It does like very cool
The G-88 bass was beautiful- top shelf build, comfy neck (shallow, P-ish width), and the 2eq pre was actually pretty nice. I didn't really need the synth part of it, though, and as a bass I felt it sounded vaguely similar to my Stingray and P (sorta); therefore, I ended up selling it to fund other stuff. The two six stringers I have are fantastic guitars- sold my Strat and SG, and kept those instead.
I've played the G-77 basses (the one in Ilan's post) a few times in the past, and remember them being equally nice. Feels typical of mid-80s Ibanez. The bar on top is graphite (IIRC) and supposedly works to improve the tracking of the synth. As a bass, though, they felt very rigid and stable to me (in a good way)
Keep an eye on TB- every once in a while one will pop up there. There were black (my fav), red, and white versions of that bass, and they all have 1/4" jacks and can be used as a normal basses/guitars without all the synth stuff.