I have a handful of the YJPS v1.1 prototypes still, and had planned to wait for those to get out in the world so I can get some independent feedback before getting the production run. Meanwhile, I've tweaked the board a bit based on the results of that first v1.1 build, and am prepared to do more tweaks.
Nothing I've done to the board so far is more than just minor usability improvements; because I don't expect any major changes, I don't expect the performance to change between now and v1.2. It could be that someone will come up with a bright idea to improve performance that I will adopt, but it's already so good that I doubt that. Or, it could be that I screw up in making my changes and hurt the performance, but I haven't done that yet despite several revs, so...
I won't let this prototyping phase drag on too far, but I won't rush to production, either.