The Heatshield is a roll-up. It's main problem is that it doesn't have any stiffening ribs so after a season it's about a foot away from the window. The workaround is to carry a couple of empty boxes to keep the Heatshield pressed against the window. That extends the life to about four years.
I've had my Heatshield for my Prius for about 8 or 9 years and still use it.
I bought one and it fits well. The problem is that it relies on the visors for support...and we all know how short the visors are. It works well for now as I don't have to use it much.
I bought one of the Heatshields from Amazon and am regretting the purchase. As others have mentioned, it rolls up rather than folds, but the direction it rolls up is awkward and it's so large that you can't flip it over to roll it up tight. Plus, once it heats up it sags pretty severely. I'm not sure if the fold up ones would be any less cumbersome but if I had it to do over again I'd get one of those.