Yes definately try direct, you may be very surprised.
Just looked that dac, it is the swiss army knife of dacs and uses a AKM (Asahi Kasei Microdevices) dac, not bad for a delta sigma dac, I prefer R2R ladder dacs.
If you do decide to try amp direct I would love to hear your comparisons! I think I will wait till my local guitar center has one in stock then go snatch it up.
It is confusing to me the weight differences in some of these DACs. My Wyred DAC-2 years ago was something like 15 lbs. I believe some newer ones are heavier as well. What can account for 2lbs vs 15lbs in a DAC?
I've run my ADI-2 directly into my poweramp (Rogue ST100) and it sounded good, albeit a bit drier and less full than when running the ADI-2 through my preamp (Rogue RP7). I suppose these are preamp colorations (or perhaps there was an impedance issue with directly driving the poweramp?) but the DAC into the preamp sounded better to my ears.