It's a pretty simple set-up, with some flaws even. I got a recumbent through Sun bikes and added a Bionx motor. (Sorry, no pics.)
But it allows me to do things that I couldn't before, like making a left hand turn with traffic at an intersection. I wasn't fast enough to pull that off, but now I use the throttle to accelerate through.
I also love accelerating faster than cars (since they're heavy) at crossings. They do beat me eventually, but I often hear a blast on the gas as they try to beat me through. (I'm thinking that all the gas I'm saving might be burned up by motorists getting PO'd at the intersection.)
Then, being able to do normal bike things, like riding bike paths (slowly) on top of being able to deal with traffic when on the street. It's the best.
And today, on the way, home, I rode it harder than usual. Geared it up on the non-motor wheel, tried to maintain speed, and worked the mucsles. I'm mildly sore, but I know it will make me faster next week.