Summary: After battling with an inferior model, this one installed like a dream. It was completely plug-and-play. The configuration software already had it worked out, so there was no need to change any settings. I also bought the USB power adapter, so I can keep the two USB sockets on my MacBook Pro free for other things. I use three screens on a mounting bracket above my desk, with my laptop below the middle screen.
Summary: This thing works exactly as advertised. Fantastic for use with flight sims. BEWARE! MSFSX does not support a triple monitor resolution. BUT... MS Flight does and looks beautiful. Highly recommended.
Summary: I ordered the Matrox TripleHead2Go Three-Monitor Graphics Expansion - Digital Edition T2G-D3D-IF (used) from this seller, on the Amazon site. I gave it a couple of days before even checking how long before I received the product and, low and behold, it was in the mailbox that very day! I wasn't even expecting it for a few more days! He must have taken it right down to the mailbox the very day I ordered it!
Summary: i recently used this for a 6 screen video wall (2 matrox triple heads on a 2 output video card), and it worked beautifully. just make sure your card supports high resolutions. im running it at 4800x600. also converting the signal to hdmi and using cat5 extenders with no signal issues. windows 7 has support for multiple video drivers through the OS now finally, so im sure you can do even more with these little boxes.