Works great for me. Solved 2 problems I was having with 3.5.2, both seem related to synchronization of an extruder on an expansion board. See https://forum.duet3d.com/topic/37435/extrusion-gaps-after-arcs for one of the problems and my config.g for reference on what features I tested.
The other problem was sharp corners looked like they had too much pressure advance, even though I was using 0 pressure advance. They were under-extruded going into the corner (while the printer was decelerating), and then over-extruded after the corner. I had assumed it was due to the huge SuperVolcano hotend, but upgrading to 3.6.0-beta.4 fixed it.