The cell itself weighs probably about 20lbs at most. The advantage is is it's a uniform box, 8AN fittings (1/2") for feed and return, and it's filled with anti-slosh foam, which works better than baffles. I can also decide where to position it, so I can move it towards the center of the car more, giving it better centralized weight distribution. It also comes with a small built in sump in the rear. My reasons for getting it is I'm going with a rotary, so fuel starvation would mean death. Plus it was cheap, $170
The cell is going to be vented to the atmosphere, and yes, to fill it up, I'll have to put the pump through the hatch, under the carpet.