I have a CPR2 Bakpak on my 15 gallon propagation tank and it does an amazing job, sometimes I think better than my Aqua C EV-120 on my 58 gallon tank, although I think that may be as much to do with fine tuning or the right pump as anything else.
The BakPak 2R just seems much easier to fine tue to get the skimmate viscocity that you are looking for. Although I have to admit that I do not clean the BakPak nearly as often as the Aqua C as the Aqua C is on my main tank.