for anyone who's looking at buying the xp, i just bought some of the .6" xp (2.5 oz) from thru-hiker and the 1.2" (5.0 oz) xp as well. the thicker 5.0 is basically just twice as thick/heavy as the stuff nc patric used(the 2.5)
i thought the 5.0 was much better quality. it seemed to have a much more consistent thickness throughout, where the 2.5 had visible thin spots in places. i was able to avoid using the thin spots, but this was because i ordered slightly more than i needed.
i also noticed that xp is listed as coming soon to www.owfinc.com
they already have weights, thicknesses and prices listed. it looks like they will have the exact same weights/thicknesses thru-hiker sells, but for slightly cheaper. their delivery times have always been much faster as well.