I bought mine to emulate the phase sound of Lee Perry who used a prototype Bi-Phase. Although the production model doesn't sound exactly like his, it's naturally far closer than anything else.
My particular unit seems to thin out the sound a bit on some sources like some synth patches - but not so on guitar.
There's no hiss and I don't find any problem with the signal strength.
Mine had obviously had a very busy life before I bought it, apparently being extensively gigged. It's bashed and battered. It even has a hole drilled in the bottom so it can be put on a mic stand. I know it was one of the earlier units, so is about 32 years old.
Despite all that it still works perfectly.
I mainly use my unit for dub reggae. It rules.
There's nothing else that sounds quite like it.
I don't use the stereo or pedal control capability but it has all that to offer.
I doubt I could afford to buy another one, I'd feel like I'd lost a family member if it went.