I had one of those levers on my stock Throttle, it worked nice. It's longer than the stock lever so it makes the throttle easier to push. The lever is positioned a little different and you can drive the shaft out of it and change the position too. So you can make it more comfortable.
I tried one of those levers for a little while. The easier to push part is great but the additional lever travel sucks. i always found myself "choking up" on it and basically using it like a shorter lever anyway.