Just saw the update on the Peachy Pro:
https://www.youtube.com/watch?v=QgBVKCh5YXg
This looks great. It'll be interesting to see how much better it works with feedback, and hopefully there'll be upgrade kits available eventually.
The Peachy will probably benefit more from feedback than a conventional FDM printer would (because steppers are discrete, so as long as you don't miss steps it will actually end up exactly where you want, whereas the galvanometers are continuous). On the other hand, the basic Peachy seems to be doing just fine without feedback.
It continually amazes me just how
innovative this team is - pretty much every other printer is "we took a Reprap and changed a bit of stuff" (went from threaded rods to belts or vice-versa, put a fancy enclosure on it, switched to a delta configuration, etc). The Peachy is about as different from any other printer as you could possibly imagine.