My electrical trouble started with a bad high pressure switch on circuit #2. It was a surprise to find they use an auto resetting switch that cuts out at 285 psi and in at 230 psi. The next problem I had was with a failed capacitor, but that could happen to any unit so I don't fault Freus for this one. The last problem I had was with the time delay relays, they would keep the compressor for the #1 circuit from coming on.
My issue with the assembly quality came from a wire nut they used to hold (4) solid 12ga wires together that was for one way too small but also wasn't holding them tight. It got hot from the arching and once it broke one of the wires went right into the frame and popped the fuses. That's what lead to gutting the electrical box. (that and my wife being kind enough to voice her disgust over the number of repairs it has needed)
As for the maintenance, they recommend you pull the pumps out and clean them along semi-annually and at the same time scrub out the pan.
Another issue I forgot to mention is the noise this unit makes. Yes there is only one unit now, but it's nearly as loud as when both of my old ones were running. The compressors and pumps are pretty quiet, and before the fan initially came on I was impressed- for about 20 seconds. Then the fan kicked on. It is LOUD! Seriously, this thing is so loud it would make a deaf man stand up and say "did you say something"?