I own the BEF Pro. It is the only filter pedal I have ever tried. Here are some positives and negatives of the BEF Pro:
Positive: TONS of options. Everything is adjustable, programmable, and affect able with an expression source. The LFO is top notch with multiple waveforms and also plays with an expression source. The graphic EQ and back page menu are also very nice for maximizing the impact of the filter and tweaking the sound. The 6 presets allow you to save a ton of great sounds.
Negatives: Size. The pedal is tall and wide. You can't have that many options without adding real estate. It also doesn't do static filter sweeps. The multiple options may be daunting if you want to plug and play. This pedal takes some time and understanding to get exactly what you want out of it. It is a bit like a compressor in that regard.