I actually have not, but all it involves is replacing all of the analog knobs and corresponding relays on the unit itself with updated proprietary digital control pad and relay board. Mount the control panel, hook up a network style cable, make the connections to the board at the unit, plug and play. Truth be known, the smxII that replaces the knobs is now just as obsolete as the knob style it replaces. It looks like MarineAir and Cruisair have both been combined by Dometic now, and they are mainly pushing the line of Vector Turbo units, which are compatible with Passport controls.
If I had a choice, I'd rather work on the stuff that has the knobs. At least you can replace individual components if you burn up a relay or if a switch goes bad. I've been nursing the a/c on my current boat along all summer because the compressor relay on the circuit board is sticking and I refuse to buy a $450 dollar board over a 2 buck relay that shouldn't be trying to handle the load of the compressor and the pump in the first place, but thats how they get you. That being said, have you looked into trying to replace your thermostat or maybe checking the location of the thermocouple? It's possible that if it's not bad, it just may be located in a place that isnt accurately registering the cabin temp. I always try to locate mine in the return air stream and keep the blower running constantly to circulate air back to the unit.
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