AD16 non X vs X
It's sometimes really hard to get an answer on the AD16 (non X)
I bought one because lets face it, they are insane value for money. I also have a Rosetta 800 and sonically they are similar to me. Just great, no complaints. Love them both.
I've not compared them to the X but it felt like a decent step up from the AD8000 aside from the lack of metering.
The only thing to really look out for is the lack of expansion ports. If you're good with AES, optical or TDIF you'll be fine.
If you see a good deal on one I'd go for it!
Don't forget it's a high end converter... even if a new end model is out which may sound slightly better I'm not convinced its of an order of magnitude that would bother me! 16 channels of apogee A/D for £900 is what I snagged and I wouldn't look back!