I use the radio and multi panels.
The radio panel works as-is with every addon i have, including the PMDG 777/737/MD11.
The multi panel had limited out-of-the-box functionality. Most(if not all) of the autopilot functions dont work, but the AT switch will usually function, and the flaps lever will work. What i find it most handy for is the trim wheel.
This guy has a fairly detailed tutorial on how to incorporate FSUIPC, LINDA and SPAD to get all the functions to work: