Do you have a "Mule" already, or going to get that after you decide on the "Cart"? :)
Is that budget for just the "Cart" or both the "Mule and Cart"?
As far as "poor construction", you can get a bad one from any manufacturer.. Just as you can get one with no issues at all.. A lot has to do with your initial walk thru and acceptance of the rig and how you maintain after the fact..
Lots of info on here and lots of informative people so take it all with a grain of salt and don't take the first thing you read as gospel and be open minded to all opinions, as that's all they are.. ;)
So welcome to the site and I hope you find the rig of your dreams.. :)
Mitch