I love my gallon+ sized resorvior. The cool thing is that when the "low fluid" indicator comes on, it has some in reserve and it holds exactly one more gallon so it's easy to fill with one jug.
I use the orange Rain-X fluid. It puts a layer of the treatment on with every spray! I just need a new wiper blade now...
Oh yeah, mine is leaking too... It's so heavy that it tore free from it's top mount.