Plastic bottom boards

[Sparky]

Has anyone tried out any of these bottom boards, is so please comment on satisfaction. I usually build my own screened bottom boards but was curious for longevity reasons.
http://www.brushymountainbeefarm.com/Ultimate-Bottom-Board/productinfo/314/

[wayne]

 I bought one this summer.
First it has some features I like, like the slide in reducers.
Secondly it is alot lighter in construction than I would have liked. Unless it is on a solid base that evenly supports the legs it warps. And it is full of holes and pockets where the form was trying to cut weight I assume. With my boxes this alows bees to slip under the wall and out through the dips and hollows. And other critters to slip in.
  Not sure I would buy anymore since I can make them as cheaply.

[Sparky]

Thanks for the response Wayne. My setup on steel frames would support the frame all the way around but I noticed in the pic. that it looked like it was hollowed out in the frame that would be in front of the box at entrance area and did not like that. Is that accurate?