Have a Chromebook Flip? Get it on the developer channel ASAP - the Play Store update is rolling out now. I've had very little chance to mess with it, but the apps I have used (Hangouts, Maps, Search, the Play Store) all seem to run pretty well. Funnily, the Play Store still allowed to install Google Now Launcher... but you can't change the launcher, since the launcher is the windowed app mode.
I haven't tried any games yet, and a number of apps you might want - like Google+ or Talon for Twitter - are marked incompatible at this time. The developers will likely need to account for the hardware capabilities of the Flip and other Chromebooks (specifically, the things it lacks) and be sure to tailor their apps to devices without certain features down the road.
Anyway, this is just a public service announcement - go get it, and have fun!