The Straitline AMP is a very stout, nice looking pedal with plenty of grip. The only thing it lacks is platform size!
These pedals use a very large diameter axle with IGUS bushings instead of bearings. Bushings excel in high load, low RPM situations and should be great in a pedal. They do feel a little stiff when spun by hand, but the drag is imperceptible when riding. The use of bushings allows the pedal to remain low profile while also allowing the axle to be much larger than a typical pedal axle. If you are a heavier rider or jump/drop a lot, these (or the Straitline DeFacto) are the pedals to have!
The hex pins and pin placement make these very grippy pedals. Slipping a pedal was never a problem. There was some squeaking due to my shoes contacting one of the retaining washers as I pedaled. A couple more pins right next to the outboard washers would solve this minor annoyance.
The Q-factor, or tip-to-tip width of the pedals on the crank is very small with these pedals. The pedals sit close to the cranks and they are also quite small. On a bike like the Specialized Enduro I put them on, with its large chainstay and seatstay tubing, 10-speeds and wide axle, it means you have to be very deliberate in pointing your toes in and keeping your heels out to avoid striking the frame while pedaling.
Overall, the pedaling position that had to be maintained was uncomfortable for me. And even though I never came off of them, the AMP pedals didn't give quite enough pedal surface to feel secure under my size 13 shoes.