I came late to this thread, I have a Puffin DSP, and it is awesome, I modded it to output digital trough optical and I can use my own dac, and now my turntable is completely electrically isolated from the rest of the system which results in the most quiet phono preamp I have ever used. The owner of the company is a great guy and keeps coming with updates to the firmware and who knows what other functionalities will be added in the future.