We didn't review the standard-definition Veebeam SD, but we did review the high-def Veebeam HD.
The main difference between the two is that the Veebeam SD cannot display PC sources streamed from the USB antenna in high-def. It lacks the HDMI output and optical digital audio output of the Veebeam HD, and cannot display 1080p (or other high-def) movie files, high-resolution photos, or the PC desktop in HD.
The Veebeam SD can handle input resolutions of up to 1024 x 768 (for the desktop) and 1280 x 1024 (for photos and video), but its output resolution is limited to 480i. Its only outputs are composite (yellow) video and stereo (red and white) audio jacks. There's also a USB port for future use.
For more details check out our