Anyone used this?

[wetdrip]

Has anyone used this:
Eco-Floor Insulation Solution - How To Insulate Concrete, Timber and Suspended Floors. Complete Kit. - YouTube

Looking at the above as an alternative to using celotex underneath floorboards, any thoughts.
Oh, and if you're looking to renew your carpet/underlay found this website for top of the range underlay at a good price:
Tredaire Dreamwalk 11mm Carpet Underlay. Buy Tredaire Dreamwalk Luxury Carpet Underlay online at Trade prices

 

[Ermintrude]

Looks like bubble wrap.... Pop pop pop! You could use it under floors but space blanket is better and I would still use celotex!

 

[wetdrip]

Leaning toward the celotex route myself.