Yes, klipper on a Ender3 with a Raspi 2 doing the serving.
I find that I can print considerably faster. Presently limited by cooling capacity, only 1 4020 fan. Will print a new manifold that mounts 2 4020's, then should be able to print faster again.
The other huge benfit is being able to change parameters without recompiling Marlin.
Moonraker etc are on the Raspi. Great documentation. It does IMO require going through Teaching Tech's process to tune to best effect.