I have these ramps - for the price, they're great.
A few notes:
- My vehicle weighs less than 5K pounds, fully loaded.
- They were used in some pretty deep sand, and then in mud.
- Have not needed to use them as a bridge (yet!)
I've heard of them cracking and breaking, but if they're going to be used as a light-duty "save my butt" tool, especially with a lighter vehicle, they're perfect.
If a heavy-duty traction ramp is needed with a heavier vehicle, over a long-term and very challenging trip, I'd go for the MaxTrax.