Tyson...I'd be in for a pads worth of Prodex and I'd pay double the $7.50/pad cost. I can't place the order because I'm in Canada and Prodex wants $100 to ship a roll here which is insane. I'd pay you $15 + $10 shipping for a 2' x 6' length. $10 should easily cover shipping via the cheapest option (USPS First Class Mail International). If we could get 2-3 more people this could work.
Eric...I agree with your analysis but I do have 2 points to add. Also the RR Solar is R 3.5, not 3.6.
1) The RR Solar is indeed the standout in terms of warmth for the weight, but a lot of times this much R-value isn't needed. I personally have no need to add R-3.6 to my sleep system, so I'm looking for the pad that will add about R-1 for the least weight. With my NeoAir I've fairly pretty well on snow on several occasions and I'm just looking for a little extra safety margin.
2) This sorta goes against point #1, but I think there is a real possibility that Prodex will do better than R-1.1. Reflectix uses large bubbles which offer very little insulating value since the air is free to move around in the bubbles. Prodex uses CCF between the reflective layers, so it should be more insulating as the air can not move around nearly as much.
Prodex is almost like a thinner version of the RR solar. Both are CCF pads with reflective layers. Based on this, we can calculate a very rough R-value estimate for Prodex:
The RR solar is 19mm thick. We know the R-value of it without the reflective layer (3.1) because the old RidgeRest Deluxe is the same thing without the reflective layer. The R-value of CCF foam rises linearly, so a 5mm thick version of the RR Deluxe would be R-0.8. So Prodex at 5mm thick should be about R-0.8 plus the benefit of the reflective layer. This isn't totally accurate since they are different kinds of CCF, but I think we're in the same ballpark here.
We know that the reflective layer on the RR Solar adds R-0.4 even though it's only reflective on the top side. Prodex is reflective on both sides. The reflective stuff on the bottom probably won't do much, but it might help a bit. So as a rough estimate, Prodex should be about R-0.8 (5mm CCF) + R-0.4 (Reflective on top) + maybe a little more (R-0.1?) for the bottom reflectivity. So that adds up to a very rough estimate of R-1.3.
There's a huge number of assumptions in the above calculation and you could easily pick that estimate apart, but I think that the point stands that if you are looking for a pad to add about 1 to 1.5 R to your sleep system then Prodex does stand out as being the lightest option mentioned so far that does this.
Perhaps we could send a sample of Prodex to a BPL tester? I think Roger Caffin did R-value tests for that recent POE review and perhaps he could test a sample?