Has anybody had any experience with the P-2000 insulation systems? There seems to be little information regarding the R-value performance of any of its products due to the fact that the company does not rate its performance based on R-values. The claim is that it a 5/8" panel will outperform 6" of fiberglass. I guess I would like to chat with someone who may have any knowledge that could shed some light on the mystery surrounding the performance claim.