I bought just the glass window/curtain from them since I scored an OEM GM Top on Ebay.
The top overall was actually easier than I thought it would be BUT I will warn you that fitting the back window curtain and top to the rear tack strip is quite a challenge to get perfect on the first try. You are basically stapling the top and rear window curtain as one onto the tack strip and thats what makes it hard to get perfect the first time, I still need to go back and pull the bottom of the back window down further and restaple it so it will be tighter.
If you search on google for installation of Camaro Convertible Top you should be able to find some useful information.
OH if you do decide to do it yourself make sure you protect your quarter panels with something because when you have the rear bow/tack strip loose it will definitely scratch the **** out them even when you are careful.
If you need any info feel free to pm me I will try to help the best I can.
I went from this: