Another thumbs down for the 12x12 "Sierra" model. Used mine for the first time last night and the quality of the folding pieces is not good. I popped one of the brackets when trying to fold it down.
I've still got my receipt, but I'm going to have to sweet-talk the store during the return since it's been just over a month since I bought it.
Next time, I'm definitely going with something in the $300 range for better quality.