I replaced the solenoid based shore-power Gen switch and landed on the exact BlueSeas switch Alan used- I don't like automagical switching, especially with the 50 /60 hz issue. I also have an isolation transformer that will be going in very soon for the shore power.
In my case, I did not install the switch in the engine room, rather I ran the necessary AC wiring to this box (now a junction box) to a location in the Gally next to the AC Panel and just above the Genset Start t so I can work everything AC from there.