The Little Giant wastes a lot of power, just because it's a true mag drive: the AC motor turns a spindle to which a set of magnets are attached, which in turn rotates the impeller.
The advantage is that none of this extra power ends up in the loop, because the motor is thermally isolated from the housing. The pump motor has a built-in fan, and under a certain load, it will start exhausting pretty warm air: warm enough to want to create a special vent just for it.
It would fit in my Chieftec Dragon DA-01 (see sig) but it would be a hard fit. I opted to go with the (leaky?) Johnson pump instead (see sig).
Pump info:
www.lgpc.com