First impressions for the Bushmaster with venom upgrade (it's optimized for LCD2, which I don't own)
Mac Pro > Audirvana Plus > el cheapo optical cable > several Grados family members, all modded; HD600; modded HFI780 (Stax but that's another story and rig)
Music listened was mostly Classic Rock, Prog Rock/Metal, Classic Jazz. Mostly lossless ALAC, but ripped a few tracks in AAC @250ish and 192.
Pros: Very, very detailed; Fast paced; Amazing bass: articulate, textured, impactful; excellent for voices: you can hear voices as clearly as I have ever been able to, amazing; drumming in general is excellent as well as most instruments in general -> great timbre and loads of texture!; macrodynamics are incredible. It retrieves a lot of around the scene info since all audible cues that were captured by the mic just pop out of nowhere; Transparent. Great case/faceplate combo for the price; Apparently a linear PSU will improve a lot of things I hear and I plan on getting one as they can be had for not a lot of cash (this will lower the bang for the buck factor, though)
Not as good: Not a lot of air on the highs (not a lot of air in general, but this is not a sissy's music DAC as it's very engaging); Can sound congested in complex music; Microdynamics seem a couple of rows behing if this makes sense; Hot upper mids which can make Grados sound a bit tiring, but hey... it's a Grado (which I love too much); In your ears sound: little soundstage; Lossy music sounds... lossy when looking at redbook; Bad mastering sounds just like that; Volume control feels a bit flimsy; Not great at low listening levels as channel imbalance kicks in (no biggie for me)
Cons: analog RCA outs are too close for some of my ICs. Wireworld Gold Eclipse connectors barely fit... but they cost several times the Bush.
Last note: The HD600 (old drivers, stock cable) sound really amazing with this puppy. The HFI780 bass is the best I ever got out of anything with them.
Overall: Sounds like an amazing product for the price. Unbelievable, really, how little cash can get you so much overall quality.