I use it and am very happy with it!
Keep in mind I live in Florida so I use lattice for the walls, I don't know how different it would be if you were using plywood.
The manual is very helpful as far as building instructions and the shopping list is also very clear.
I put the eight foot frames in my garage as is which makes it much easier to out together from year to year.
Also I have a friend who bought his own braces from lowes and then followed the instructions and he told me that he found that he didn't really save any money.
It seems (at least a few years ago) that it is competitively priced.