Best Of

+1 for Ergotech - I had a couple that clamped onto the desk that worked wonderfully.

Had an Ergotech 3 monitor stand at my old job. Very similar, if not the same as the one you linked. I wouldn't exactly call it great. I felt like it wasn't all that sturdy, though part of that was probably the fact that it was free standing not bolted to the desk. The arms sagged a bit from the weight of the monitors and made it impossible to get the monitors squared up with each other. The adjustment mechanisms were a bit hard to work with in my opinion. That said, I never saw any other monitor stands in the office that were any better (in fact, most of them seemed to fare worse)... so maybe they are the best and all freestanding monitor stands are just blah.

If it had been an option, I would have done what I did in my old house. Wall mounted my monitors on Cheetah arm mounts. That worked far better IMO.

Sounds like the stands won, but if you do consider wall mounts I have two of these and they are awesome. Let's you easily convert from stand to sit if that is important and extra desk space is ace.
http://www.amazon.com/LX-Wall-Mount-LCD-Arm/dp/B00358RFJ8/

@Thrax said:
Ergotech is best. Would not compromise. Know it's expensive. Check with Skip Clarke/wsgf on twitter with questions.

+1 on this. I have their 3 over 3 setup and have no complaints. I've also used it as a 5x1 portrait setup with 24" displays and had just enough room to install a sixth on top in landscape.