I would disagree with that slightly. Sure it has it's limits but as a purely widefield accessory it will take any modern dslr and shorter length lens.
I can't test it's max load out myself or at least haven't thought of a way of testing it's capacity but I'm willing to bet it's a bit over the weight listed.
There is even this guy in Japan who is making up various systems and even with counter balances, with varying success.
http://telescodeliver.blogzine.jp/ko...polarieni.html
http://telescodeliver.blogzine.jp/ko...polarie_1.html
And there are other bigger setups too.
http://www.singastro.org/forum2/view...hp?f=3&t=10473
Look for madjohns post on page 2
http://stargazerslounge.com/topic/13...t/page__st__20
Not to mention the images in his threads speak for them selves.
So I guess depending on what you exactly want it could be perfect for it. If you want to loads lots of things on it then probably not.
It's a solid little unit. It will make light work of any dslr and 18-24mm lens.
I'm not saying that is what Greg should purchase as it may not be for him just I wouldn't write the polarie off because of minor weight concerns.