Great question. I was wondering about this for a long time myself. I am assuming that Purifi sounds a bit like the Benchmark AHB2 from what I read on Soundstage Global about the Purifi prototype from Bruno et al
I did compare the LSA Voyager 350 GAN with the AHB2 and the stock Voyager was not as clear or clean sounding on top as the AHB2. I got it modified by EVS and that made the top end become crystal clear almost like the AHB2 (a great mod). It was also more powerful than the AHB2. However, I kept the AHB2 and sold the Voyager. I found the Voyager less powerful overall than my CODA #8 so the Voyager was in a middle ground between the AHB2 and the CODA #8. I did not need an amp in the "middle ground" so I sold it.