They are great pedals. I had been playing mine for a couple of years before I switched to a jojo pedal.
For me the experience of the pedal was as advertised. Speed and power. More specifically speed and power when playing heel up. With this pedal I could roll off doubles and triplets with ease and volume. The only problem was I got too dependent on it and when I tried playing a normal length pedal I could not play with as much ease. Also playing heel down was difficult for me due to the length of the board.
With the jojo pedal I'm having to recalibrate my playing more and use more ankle and less leg.
**fun fact** you can totally put a Gibralter strap on the Speed Cobra.
Check it out: http://www.youtube.com/watch?v=D16Xdk5qnXg