Loud enough to be noticeable, especially when loading. It's much quieter when playing a disc, but possibly it'd loud enough to be annoying to some people (sometimes it whistles to itself). It doesn't bother me from across the room.
Also does it show 4:3 standard def extra features on blu-rays in their correct aspect ratio or does it stretch them out?
After configuring the output to be "pillarbox", it works fine for me for all aspect ratios on a widescreen display.