I can't speak for the UltraScope, but I picked up the DRG PureTone Traditional (tactical black, cuz I'm a dork that way) and love it.
Before mine came in, I borrowed a Litt Classic from one of my classmates, and liked it. But, the DRG earpieces are *it* for me. I have funky shaped ear canals, and the Gel-Seal earpieces just rock.
Comparing the PT Trad and the Litt Classic, I'd say that they're about the same, from what I was able to hear. I'd like to get my hands on the DRG Cardiology, though.