Diwei Dual/Quad Monitor Stands: Anyone have one?

[kadaan]

I just saw these on Amazon and they're quite a lot cheaper than anything else out there. I was wondering if anyone had any experience with their quality before I picked one up. The 2-monitor one says it holds up 2x 22" max, but the quad one doesn't specify max size. I've got a 24", 22", and 17" and I'd love to put the 24" and 17" (portrait) on the bottom, with the 22" on top (above the 17" probably, for balance, and adjusted as close to center as possible.)

Dual LCD Monitor Stand desk clamp ($40)
http://www.amazon.com/Monitor-Stand-.../dp/B001HHNCQY

Quad LCD Monitor Stand desk clamp ($89)
http://www.amazon.com/Quad-Monitor-s.../dp/B001HHNRFK

Thoughts on either the stands themselves, or whether you think the quad would work the way I proposed?


edit:
Noticed they have models with stands instead of clamps, and a hex clamp:

Dual LCD Monitor Stand (free standing, $56)
http://www.amazon.com/Dual-Black-Mon.../dp/B0026MGO82

Quad LCD Monitor Stand (free standing, $89)
http://www.amazon.com/monitor-stand-.../dp/B001I12I3W

Hex LCD Monitor Stand desk clamp ($180)
http://www.amazon.com/Hex-monitor-st.../dp/B001HHSTBC


edit2:
I picked up the quad stand, thread about it here: http://www.dual-boxing.com/showthread.php?t=22400