I use a GFP-750 and tried a Freya and found the Freya notably inferior. Veiled and poor imaging. I ended up returning the Freya with a note that I thought it might be defective, but Schiit never notified me of a problem with it. That said, I am still not convinced that I didn’t get a defective unit, as the sound quality difference was quiet large, far more than a preamp should ever be.
For the record, I like Schiit products and use their dacs, headphone amp, and phono pre.