Winner over Scabs, 187's
I ordered four sets of knee pads to compare the thickness, fit and comfort of all the pads. I put them on, did some knee falls onto carpet, inspected every feature. The S1 knee pads, though costing more than the others (almost double in some cases) were the clear winners. Reasons: + Extremely secure fit. I was replacing a pair of Pro-Designed custom-fit knee pads I bought that were slipping when I fell, despite being custom to my own measurements and wearing them with gaskets. These stay put no matter what angle I fall at. + Comfortable: I fall on little pillows on these. I have torn ligaments in each my knees multiple times thanks to skating, and these are the most comfortable for me that I've tried. + Flatter profile when bent compared to 187: 187's, both derby and pro-derby, challenge the S1's in thickness, but I found them to be bulky and move when falling. The derby version are still my second favorite knee pads. However the S1 pad just makes more sense for falling on flat ground. My knees do not twist due to bulky padding between my knee and the ground. All in all I'm extremely happy.