Bubble Wrap Pros And Cons?

State just did a lunch and learn for Bubble Wrap Insulation. There's some stuff called rFoil Big8 that produces R-8. Anyone else have any luck with any bubble wrap insulation? Do you like it or have you had issues with it? Looks like most companies want you to use spacers to get a better R-Value.

https://rfoil.com/media/rFOIL-2280-Series-BIG-8-Duct-Insulation-Brochure-Y24-14i-web-1.pdf