I have had my unit for about a week now. Used it for some actual real-world recording sessions.
I also had the 2496's.
The A16 Ultra is clean and quiet with just the right amount of upper frequency warmth. In other words, you can use this device all day long and it won't annoy your eardrums. Some AD convertors are little too clinical for me. I've always thought Creamware products had a warm (but accurate) quality.
The unit isn't pretty. Basic grey. Looks kinda bland sitting next to my Pod Pro

The 2496's had better silkscreening.
Runs cool. No fan. Uses an external 12VAC adapter. The I/O jacks on the back read from left to right (this apparently was an issue for some although not sure why).
Compared to the 2496's I'd say the A16 has a bit more openness to it. A wider, fuller sound quality.
When I first plugged the thing in, I tried recording a solo acoustic guitar with a single Neumann mike through a JoeMeek preamp (using 3DAT). Like having aural sex
