Seems like I got them for around $45, but I think they have gone up. Yes, the $54 is a little high, but a LOT less than replacing the electronics in even one engine. I also have the PH-180s and PSX-ACs and the PH-180s don't trip, just the PSX-ACs do. To be completely fair here, there is no 10 amp setting on the PSX-AC. I have them set at 8 Amps which might give them a jump on trip time. Would have to look, but I think the next PSX-AC setting is a little over 12 Amps. Maybe I will try that someday and see who wins the trip test.
If I knew then what I know now about the PH-180s, I may have done things differently? OTOH, I like all this electronic gadgetry so I may have gotten the PSX-ACs anyway? They are pretty neat devices. I am pretty sure I would have gotten them at the $28 price, probably would have taken me little more time to convince myself at $54 though. 
