after 4 years of ergo....I tried adtec visidec.....and it's the way to go. just as sturdy, much cooler looking, and easier to swivel monitors......check out prices on ebay, amazon, and buy.com.....some models cost more, some less.
I just received a quad monitor stand that works well for me, and it's cheap. I've been using it for about a month. My requirements were minimal. It holds my 4 monitors. I don't move it around once it is set. It does not wobble. I was suprised at the heavy gauge steel for the price.