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The injection pump is there to eliminate on-throttle lean conditions common on standard carburetors. It's hard to explain to people that have never experienced the two types side by side, but on the standard carb, when you crank open the throttle there is a delay there between opening and acceleration. With the pumper carbs the throttle response is much more immediate, which some people often describe as a "light switch" on and off feeling.
While on a standard bike just used for riding around town, tuned a bit safe, it's not really necessary. I personally prefer them, especially if you are trying to tune the engine for optimal performance. The inverse of that is you will often see a small drop in fuel economy, but that only comes into play during acceleration. During constant throttle and cruising it will be the same as always.
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