Watched that second video with Alex Hutchins, it sounded a lot better to me. A lot more usable sounds. Also, saw the part Voes was referring to (3:54 in the video) where Alex said even though he'd been with Roland for awhile he wasn't a synth guy, so wasn't good at making patches. Could have foolded me, loved the Axel F "good 'ol synth" patch he made.
I think the guys over at VGuitar/FutureGuitarNow forums (Assuming the forums over there are still active) will go nuts over this as they seem to be one of the most diehard groups when it comes to Roland guitar/synth stuff. Looks to have the old GR-300 synth in it as well as other LFOs to play with and all that without having to go the 13-pin route. I always hated having a nice guitar and having to either route out wood and install an internal 13-pin system (Expensive and would ruin a good guitar) or mount an ugly attachment to the top of the guitar to get 13-pin compatibility. It'd be nice if the unit was able to do polyphonic guitar notes to midi using only the 1/4" instrument cable. If it could do that and track faster than 30ms on the low E string, I'd be interested.
So, yeah, Roland is still recycling their 80's sound engines in the SY-300, but at least they're innovating in being able to do it without the 13-pin nonsense.
Edit: My bad, the GR-300 came out in the late 70's not the 80's. Ridiculous!
Double Edit: With all the processing power in the AFX a monophonic guitar to midi block for triggering external synths would be child's play. A polyphonic block might be doable also, but only having a single channel to discern notes presents a lot of problems. I have serious doubts though if that kind of functionality would even be widely wanted. In my time over at Vguitar/FutureGuitarNow it never really seemed like a large group and I would assume that pretty much 90% of guitarists interested in guitar synth stuff visisted there. And of all the users of those forums, maybe half were specifically interested in the guitar to midi functionality as compared to the Roland products modeling capabilities.