I just got it last night and did some quick tinkering with it.
I installed OpenELEC for playing movies so some of what I may have found may be quirks in the OS or the hardware.
I projected onto a white window shade in my office with a light on. At 4-5 feet away from the shade, it filled ~34" diagonally. Overall quality wasn't too bad especially with ~40watt light on. Movie was recognizable but maybe could have had better contrast/blacks. Acceptable quality for a "buy a computer get a free pico projector".
Sound was a bit of an issue. It had a plug to cover the optical out on the front panel. If the plug is fully seated, the Brix internal speakers didn't work. If the plug was not fully seated, the speakers worked. The volume was loud enough to play over the CPU/projector fan. With nothing coming out of the speakers, the CPU/projector fan was loud enough to hear. OTOH, my head was under 3 foot from it so it may not be too bad.
Hardwired to the network was fine. I didn't test the wireless. One issue I ran into was not being able to see the window's folder on another machine. Probably OpenELEC issue :|
I would have to say this is a better deal than the equivalent NUC(D34010WYK1)