I use to have them and they were uncomfortable as hell. They also don't provide very good leverage since the lever is small. But the worst part about them is you have to remove all of your tape them get them on and off. There is no hinge on the clamp. I've read on how people pry open the clamp and get it on, but for that price I wasn't going to try to pry anything open.
I've used an e-lever before and enjoyed it. one finger brake action. solid construction which is typical of Paul components. the braking feel is pretty solid as well -- the lack of a spring mechanism feels great, surprisingly.
the only flaw is a lack of a hinge. I had mine on a pair of Nitto Noodles and with a little grease, it slid on quite easily.
If you're planning on riding long distances with descents (where you'll prefer something more ergonomic and something that you can use more than one finger with), I would not recommend, however.