Calling all ios 7 users out there sould i ugrade to every new version of ios 7?

I mean i know it won't harm, but is there a need? Will it make the iphone work more efficiently?

I think it just adds a bunch of cool features but it won't make it faster because it does not change the hardware just the software.

IOS 7 is great, by the way if using go to General, Accessibility, Reduce Motion, and turn it on, that gets rid of all that motion and its far better imo!

Personally the rule I follow is: If there are features I want then I upgrade as long as I have the hardware to benefit. If an older phone then stick with iOS 6 especially if everything is good. For example if I had iphone 4 or 4S and they are working great then I would stick with what you have as iOS 7 is really for 5/5C/5S, because you get airdrop, call blocking, bigger virtual keyboard, etc. You can always get the latest OS when you upgrade in the future and trade in your old phone to make it cheaper.