Nicely summed up Steve.
Derek, I know that's a chunk of change, and you know how poor I am, and I love the unit (read: it's worth the money, especially since you are so meticulous about your operating temps and have such a beautiful ride).
Like Steve said, you dont get that crap of having the fan come on at 195 and off at 187 (for example, with a conventional controller and relay set-up). It seems like mine ramps up at 187*F and it just keeps ramping up accordlingly. Temps literallly just stay put or drop (if temps rise 1*, it sees it and spins the fan up even more). I also got the rheostat, so I can fine tune the setting, which is kinda fun.
And because of the 'soft start', it wont jar your charging system with a huge start-up draw.
Once someone starts to price a 75 amp relay (the best relay for about any conversion if one wants reliablity), a conventional controller, etc, the nickel and dime price comes close to Brian's fan controller.
I consider myself semi-intelligent and knowledgable with cooling stuff and even so, Brian intelligence and service blew me away (we had several longer email exchanges, during the weekend no less).
It's just a nice way to do things, funds allowing.
