Theowrote a review of Demon United Flex-Force X D30 Short Body Armor - Men's on October 31, 2014
Familiarity: I've used it once or twice and have initial impressions
This review comes after trying this, the under armor football padded short, and RED padded shorts.
I find that the d3o pants fit well (S; 130 lbs, 5' 9", 28" waist). Despite feeling the pads on the back of my thighs, I don't feel that it affects my mobility - I've tried jumping, running, and falling onto my butt without noticing any loss of flexibility. Furthermore, I do not feel the presence of the tailbone extension, but I'm sure I'll be glad it's there on the mountain!
The mesh material feels good, the elastic is sufficient to keep it on my hips, and is not too warm, which is perfect, so you can choose the thickness of your baselayer to regulate your heat and not be stuck with whatever the armor has. Unlike the demon snow pants, it does feature a gusseted crotch for comfort :)
The peephole is a tad small for my taste, but you can't have everything.