I'm definitely a fan of the Bastl Cinnamon, in fact I have 3 of them. I saw the Frequensteiner mentioned above as well, I recently got a hold of one of these and have quickly become a fan, in particular of the bandpass and highpass modes. You do have to be careful where you put it in your rack due it's propensity to pick up signals from other modules, but I've got it in a Doepfer mini case with just a couple other filters so as long as I'm not using them at the same time as the Frequensteiner it's not a problem. And yes it can be a little noisy but a noise gate like the one from Ladik or the one in the FX Aid takes care of that easily. You may also be able to handle that by simply putting it in front of a VCA, depending on how you're using it. But anyway it sounds fantastic.