Pros: Brilliant design and sound quality. Possibly the best consumer sound card there is.
Cons: Too awesome?
I owned the HT Omega Claro Halo card a week before this, mostly for the headphone amp. I RMA'd it for this one and WOW am I glad I did. Even though they use the same hardware, the headphone amp on this one is at least twice as loud. It powers my cans almost as loud as I would want them too, it does a amazing job.
This is a extremely good choice for headphones and replaces the need for more expensive equipment!