I has a thecus n3200 NAS. It has a few extras to serve content but its essentially happy raiding my data onto 3x1Tb disks and throwing it out to 2 macs and 1 windows machine via smb or afp.
I can't talk about performance benchmarks but I can tell you it streams music and video just fine to windows machine running itunes and windows media player and mini running plex, which is what i need it to do, and that counts rather more to me than a benchmark does ;-)
It's pretty quiet (not silent when being hammered to stream movies though) and sleeps when idle (which is good as its currently in my bedroom while i redecorate teh house), doesn't generally give me much hassle at all. Reasonable web interface that works with firefox, safari, from windows or mac.
Other than the fact that when I upgrade I'll probably want something that supports more/bigger drives, I'd be happy to buy another one, lets put it that way.