Yea, I agree. I mean I /could/ climb on one. I know how to tie it, so it's just a matter of getting it set right I guess, but I wasn't impressed with my quick attempt. What I like about a prusik loop is it's virtually bombproof. I could hardly imagine how bad you'd have to mangle it to not have it grab at least a little.
When I was fooling with the Blakes, My thought was "Ok, I'll get this set just right, it'll work, but what happens if I get a bit of slack in the system, and it unsets?" Step off expecting to hang, and get the express trip down. Dunno. I guess I just need to give it a really good shot instead of a quickie. It obviously works since it was the standard for years. Maybe it performs better than I imagine.
edit:
Got me interested enough to grab a short of Ascender and give it a shot. Seems to be working ok behind the keyboard. Maybe I just didn't put enough effort into setting it before. I'll definitely try it next time I suit up.
edit2:
I'm actually a little enthused about trying it. Might make a decent hip thrusting system. I hate hip thrusting, but sometimes it's easier than footlocking, and instead of using an extra long prusik, I could just tie one with the tail. Hope it works out...