My COB Prolite just arrived a few days ago. Managed to snag one at a black friday price before they sold out. Man, what a snare! I took it to band practice yesterday and it plays like a dream. Played it tuned sorta medium-high with zero muffling and with the stock coated ambassador, and the articulation, the clarity, and the power are remarkable. I play a lot of rimshots and I figured I'd need to use some muffling to control the overtones, but nope - it sounds perfect fully open.
I never had the chance to play the "regular" Prolite brass, but I can't imagine it being significantly better than this. Comparing my experience with the sound files of the brass snare, it sounds like the same drum (which it essentially is, with the chrome coating on top).
All in all, a crazy good snare. The type of sound you'd think could only be achieved with studio processing, but you're getting it right under the stick. I'm thoroughly impressed.