Sagging is just the nature of the materials. Even the $800 mounts for plasma tend to sag at least a bit. Even more when fully extended. Remember that if they didn't sag, they'd likely snap. A good example: I have a 24" monitor that's a little under 10kg on a mount thats rated to hold up to 20kg. It's a very heavy, solid steel, quality mount, and it still sags a wee bit when fully extended.
That mount you linked to looks to be the exact same as one I've checked out at Monoprice.com, and they reviews for that one are quite good, so I'm sure it'll suffice. The only thing that will get you less sag is a more resilient material like boxed aluminum or something. Are you ordering those two extra arms to mount to the triple-mount you've linked to?If so, expect a lot more sag. Just be sure to compensate it when you set them up.
Myself, i ended up getting three single-arm mounts, as reviewed by a WSGF member. I had been considering them, but more pics and a good review sold me on getting some. If anything, I'd worry about what you're affixing your mount to.
|