I've had the SAMWBDP for months and it is very versatile with lot's of cool sounds. The size is not much larger than the non pro version- and the advantage of 6 presets is huge. You can use one preset as an eq or boost, low gain over-drive, distortion tones, and a lots of crazy synthy type sounds. Personally I dont feel as though the distortion can replace a thick analog fuzz sound- its not aggressive enough BUT it does great distortions. You also have the option to morph from one preset to another- its an awesome feature. I would definitely recommend the MW Pro for its flexibility and unique voice but not to try and mimic other pedals sounds- not to mention it sounds SO GOOD with the BEFPro.
As to your other questions-
yes this filter will sound good with other dirt pedals before it
and you don't NEED an expression pedal for either but it will open the pedal up to new or different sounds- making the pedal more expressive. The BEFPro is an AWESOME AWESOME envelope filter- as you increase amplitude the filter sweeps higher. With an expression pedal you can make the filter open with your foot (like a wah) or keep the filter in a fixed position. You can also change lfo speeds with it, or rotate through effects. It allows you to do more. Same with the hot hand. Is it necessary? no. would I recommend them- yes!
As to your other questions-
yes this filter will sound good with other dirt pedals before it
and you don't NEED an expression pedal for either but it will open the pedal up to new or different sounds- making the pedal more expressive. The BEFPro is an AWESOME AWESOME envelope filter- as you increase amplitude the filter sweeps higher. With an expression pedal you can make the filter open with your foot (like a wah) or keep the filter in a fixed position. You can also change lfo speeds with it, or rotate through effects. It allows you to do more. Same with the hot hand. Is it necessary? no. would I recommend them- yes!