yeah, the time the fan upgrades makes wonderful sense is when the stock fan is cracked, the stock clutch is bad and the stock alternator went south.
it does seem that people spend a lot of money on switches and relays and controllers (not variable controllers but on/off controllers), so the extra cost might not be that much. the old school way just nickels and dimes you to death.
I dont have one of the variable controllers either, but am thinking about it for the 94GT.
and all the info is right - it does 'ramp up' so there is not a shock on the system. if all fans are relatively the same efficiency, even if one has a larger initial draw than another, it likely also flows more air so the controller can ramp down quicker.
on the temp questions, as i recall, there are jumper wires that one plays with to have the fan initiate at the desired temp.
i would really email Mr Baskin and ask him - that way you get info from the source and he can fill you in much better than we can (even in reading his posts, he blows me away with some of the things he says [very very knowledgable]).
good luck.