I purchased the Osmo handle kit back in April, I just purchased the handle because I have the X5 and X3 cameras for my Inspire. It does an excellent job, the built in Mic isn't good but just get an external mic like the Rode Videomicro.
Had my Osmo a few days now. Haven't used it outside of the house, but it's certainly an impressive bit of kit. The tracking mode, and programmable time lapse features are going to be really useful.
I have the original Osmo and the M1 mobile attachment. I use them alongside my Pixel 2 XL and Spark to capture footage when traveling. They're basically the best combination for flexibility and portability that you can find.
I purchased the Smooth-Q for less than half the price of the Osmo, and it performs flawlessly so far. Lots of comparison reviews online and mostly all rate it as good as the Osmo. I would agree, so worth a look for anyone considering a mobile gimble.