I think I saw a post by someone using those and the bike fell over; punched a hole right through the valve cover!
My Rivco Aero Highway Peg equipped Goldwing fell over once, on it's right side. Broke the Highway Peg (the part your foot sets on) but no damage to anything else . . . Highway Peg-wise. I was able to split the cost of just the Pegs with another person on this BB. He conveniently managed to drop his Goldwing on the left side. So we split the cost, he took the left peg and I the right. As a result the walet damage wasn't to bad for either of us. I do like these Rivco Highway Pegs. They are extremely comfortable (IMHO), they don't touch down when riding aggressively, as my Kuryakyn Ergo II's did (NOT fun!) and they're fairly inconspicuous as they blend in with the style of the bike overall . . . and, afterall, stylin' is what's what's truly important!
I have an older set of Mic-O-Pegs that a previous owner rode hard and put away wet (they're in very ugly condition appearance-wise) but they're still completely functional. I just haven't actually mounted and tried them. They do get a lot of favorable reviews.