Have you ever made a side by side comparison between the SGC and BHI DSP units?
My MFJ-784B unit works OK on SSB, but is much better on digital/CW. On voice modes, it narrows the audio pass band and fidelity even with the NR button off. I only use it for the auto notch on SSB, for multiple carriers. I have listened to the BHI, and have considered getting one... much less of that underwater sound on voice.