I was just coming here to ask the same thing!
I am running iFly (currently production build, about to try beta) on a Pixelbook. The app itself runs fine. The only real bug I have is that it doesn't receive data from my Stratux device. Currently, the hardware keyboard also seems to be disabled, so the software keyboard must be used, which is inconvenient. Other than that, all features and displays seem to work fine. Hoping we can resolve these two issues within the beta program.
Edit: I gave a more complete response in the Beta Users forum, which is probably the better place for resolving these issues.