Hey guys. I got a tip from another Head-Fier about Audio-GD so today I went down a store near me which had both the NFB-11 and NFB-15 in stock and did some testing. I'd read beforehand that the Sabre chip in the NFB-11 was considered to be more detailed and the WM8741 in the NFB-11 was smoother but I was keen to find out for myself.
I blind tested them side by side (
well, sort of blind because from the front they look almost identical and I didn't know which was which) and A-B'ed a variety of different tracks for over an hour with my HD 600s. The funny thing was that almost straight away I thought the NFB-15 sounded the most detailed of the two! The NFB-11 sounded smoother and the trebles a touch recessed so I was sure that it was the NFB-15! I did a classic double-take when I finally checked the back of each unit for the model numbers! I guess I'm lucky that the cheaper one sounds better to my ears
Anyway I am very happy with the performance so far and at its price point the NFB-15 offers great value. The only thing that's not so great are the USB drivers but I've got them working without any problems now. I have the 26th May - 14th Aug revision.