This all-in-one unit is simple to wire and simple to use. My only gripe is that it needs to be turned on to even operate in bypass mode when you have shore power. The automatic transfer switch is very fast and with four 100Ah LiFePo4 batteries and a MicroAir Easy Start, I can run my A/C for four hours using this unit. Even though I am using 4/0 wire and very short runs, there is a slight high pitched whine but its common for many inverters. However I only hear it in inverter mode under certain circumstances and there is no other noise in the trailer.
It is a large unit and very heavy. I did wire a 300A T-Fuse and cutoff switch between the batteries and this unit so I can positively turn it off from inverter mode.