Went to the BlueSea site, and checked out the 9012. Looks like high quality and high amperage handling, but from the shape and reference to a coil in the specifications I suspect it is still a mechanical unit, although a sealed high quality one. I am sure it is great for Marine applications, because salt water is **** on the iron solenoid throw. It is probably good for many more cycles than the standard Vans or ACspruce units. It should also be good for either master or starter solenoid, and physically fit in as a replacement. Guess it comes down to personal cost benefit analysis: cost is ~ 8 times the cost of the Vans unit and twice the cost of the high quality ACspruce units, benefit is reduced number of change out of the solenoids, and less chance of master or starter crapping out when badly wanted! The Cole Hersee units may still be the best option if you have the space and $$s although they have less amperage handling capability, but it would be an experiment. The 48765 is ~3x3x6".