I also have Sisters and Bark, along with two Amp & Tone. Echoing what @staticmass said, it covers different ground than Sisters and Bark. It definitely can still work as a LPF, with some interesting resonance and saturation that can be used in an additive kind of way, but I think it does best being used along with other filters. What’s great about it is its timbre and tone shaping abilities, the attenuverters, normalisation of exponential input for level into tone, the linear input over level, and input gain control. Makes for a very playable, very flexible LPG!
I haven’t tried the old one but I’ve read plenty of accounts that say it’s sweeter sounding. The new version is quite aggressive (though it can be dialled back easily, or give more to other filters to chew on). The vactrol in the old one will naturally give you a slower decay too, if you like that sound (I certainly do, though I’ve got Jolin Lab Agogo in that case to make up for it, and in my other case I have QMMG, LxD, and Optomix).
Just uploaded my first video with two Amp & Tone:
The envelope followers running into the Agogo LPG is great!