Funny, I just got a Hertz Donut mk3 (it currently lives in the space which was previously occupied by the venerable HD mk1, but I cannot bring myself to let it go) and a QuBit Prism, last weekend.
The HDmk3 has thus far exceeded my expectations in a lot of ways. I though that I would be left cold by it's cleaner character but I find that it just results in damaged sounds that are more detailed! The HDmk1 didn't respond well to FM feedback but the HDmk3 responds very well. It smoothly transitions from perturbed to completely bonkers, as you increase the Mo index, if you have the Main osc routed back on itself via the external mod bus. The Phase Distortion, Umbrage and Resonance wave shaping parameters are pretty different from the Discontinuity parameter on the HDmk1 (make sense being that the HDmk3 is focused on PD where I remember Scott saying that the HDmk1 was influenced in equal parts by the 259e and Nord Lead oscillator section). It seems like Umbrage is similar to the effect of Discontinunity when using the Triangle shape but I really liked the way that Discontinuity worked on the Sine wave. Still, I think the HDmk3 is on it's way to be a staple in my rig.
The QuBit Prism is neat as an end of chain effect but it already bothers me that I can't get a wet only signal from the delay. It will probably be replaced by a Mimeophon in the not too distant future. The filter sounds good and it's great as a resonator/comb filter. so I may end up keeping it.
This is my current stereo signal processing case:
@Foosnark...
I can also talk about MOK's Waverazor module which I've been testing for a bit, now. It's a real beast of a digital oscillator. It can also be neat for processing other oscillators. It has Thru-Zero FM and all matters of sync and pulse width modulation type sounds, on lock. It's very deep, allowing for the creation of custom wave sequences with up to 8 steps, which can be synced to an external clock. Since it's two independent oscillators, you can set it up like a complex oscillator, with the help of an external VCA or two. I had a lot of fun with the Waverazor plug-in but the module takes the concept to (what I believe is) it's logical conclusion. It's really cool how individual wave slices and be tuned and manipulated in different ways and the multi-sync function gets really brutal. Definitely recommended!