Totally agree. I’m not planning to rush out and buy either but the at the price point of the Boss I can actually see maybe picking one up especially when they hit the used market.I dig it. I would guess 90% of guitarists remotely interested in synth sounds would go for the SY-1 over the C4. Really, all most guitarists care about is -- does it make cool sounds I can use? SY-1 seems to check that box. It's simpler, cheaper, appears to track better and has polyphony.
Source Audio is well aware they cater to a niche of a niche of a niche (guitarists > interested in synth sounds > willing to deal with USB, MIDI, and phone/desktop apps). For those few, like the guy a couple posts above, it exceeds their needs and is well worth it. Whether there are enough customers in that niche to turn a profit remains to be seen.
The fact that as they put it in the main video... it will track at Paul Gilbert speeds is actually a huge plus and a real concern for some players.