Do expensive covers actually save energy?

I'm still in the planning phase and trying not to jump into anything too quickly. There seem to be a huge number of brands available that it's easy to feel confused. If anyone here has already gone through all of this, what factors ended up the most significant when making your final decision?

https://southwestspro.livejournal.com/588.html

Did you pour concrete or install on pavers? a432eb1