Some point out the lack of deep parameters and editing, but as as a competitor to similar pedals on the market, or well I guess that would actually exclusively be the EHX's 9 pedals and their newer mono synth and bass mono synth, to my knowledge at least, it is quite serious I'd say.
Way more features than any of those pedals, and unlike the mono synths it is polyphonic, and it tracks bass perfectly well all the way down unlike the 9 series.
And even though it might not be capable of producing every sound those different EHX pedals are capable of a lot of it's setting get is in the ballpark of some of those, plus it can do wild stuff such as sequenced arpeggios and sound effects non of those can.
Not everyone need to be able to tailor their synth sounds in detail, I know I would be extremely happy with this pedal at least, and for those who does there are other far more expensive solutions on the market for that.
In my opinion for what it is it in no less than an amazing pedal that is really well thought through, and even comes at a quite reasonable price compared to what it do and the quality of the sounds it is capable of.
I got a couple of other music gear related things that I need more than this pedal, so I will need to get those before I buy the SY-1, but it is definitely in the higher priority end of my GAS list.
I honestly didn't see this coming from Boss, but it is definitely a really nice surprise.