WOW filter 2 is not much like WOW filter 1. Its great in its own way but if you liked 1's modulation and stuff then don't delete 1 because 2 doesn't do the same stuff. WOW 2 definitely has some great sounding filter models. It can be subtle or extreme without a bunch of aliasing or delay.... anyway, definitely a good one but don't ditch WOW filter 1 if you have it. this doesn't sueprcede the old version, tis really like a different effect in the same camp.
I really only use this on certain bass sounds, particular the FM ones. I really like it though. It produces very digital type sound effects. It's easy to use and program and the interface is very inspiring.
I love the choice of presets and the interface is very intuitive. It doesn't focus on exact frequencies or numbers. You're definitely more dependent on actually listening (just the way I like it). Probably my only gripe is the slight attenuation of the higher frequencies when the plug is activated.