I don't have any experience with higher end amps, but this is the amp through which I demo'd the LCD-2 at a local hi-fi shop. I found it to be quite impressive. It gave the LCD-2 tons of slam and impact, while producing a rich, liquid midrange. I had a portable set up with me (iPod --> Fiio E11), so I wanted to see how the LCD-2 would fare on that, just for giggles. When I did, I noticed a huge drop in sound quality. It still sounded similar, but much more thin and lifeless in comparison. The lost impact and soundstage depth were the most apparent things that dropped out.
I've been waiting for the Schiit Bifrost DAC to come out before making a final decision on an amp/DAC upgrade. Although my LCD sounds quite fine through my vintage receiver or Fiio E9, it doesn't quite wow me the same way it did through the M1 HPA. Now, I'm really torn between this amp, Schiit Bifrost+Lyr combo or the Burson 160DS -- all of which are pretty much the same price.