Unless someone has a horror story about that particular dish, I suspect it's an okay deal.
Seems a bit high for a 30" off-brand dish, but that LNB sweetens the pie.
You can probably search around the internet, find someone selling them new, and get a PDF manual.
Though, after looking at several similar dishes, they're pretty easy to assemble.
The last one was a 31 and this one is as well. I figured the bent portion of the last dish was causing signal loss so I figured a different dish would help. No change. Turns out I should upgrade the size.