I purchased my Sparrow in the end of January and have used it at work mainly for listening to podcasts and watching Netflix ... don't judge me :) I've used both the optical and the USB from my MacBookPro and have never had a problem with it.
The unit is in perfect condition and sounds wonderful. I added rubber feet to the bottom (they stick on) to raise it off my desk and allow for some extra cooling as the unit does get a tad warm (it's their design).
As noted it's a Sparrow B with USB and upgraded with the WM8741. I just recently picked up a really nicely modded Bravo and I'm going to keep that, thus this is up for sale.
I'd prefer US buyer and Paypal payment (gift or add 3%).
Looking to get $175 shipped (paid $215 shipped) OBO.