I purchased a Mercury to install in a Turbo Raven. The ability of the Mercury to drive 2 servo aileron surfaces with the internal gyro was the primary factor.
I was a bit disappointed (my fault, I should have read first, then buy) that this unit does NOT measure/display battery capacity; just voltage. I found this out in the PB forum.
No big deal, just have to add a pair of MUI sensors and I'll have capacity again.