iPhone Selling 4S soon, any reason NOT to upgrade to iOS 7?

I'm planning to upgrade to the iPhone 5S soon along with switching to AT&T from Sprint.

Is there any reason I shouldn't upgrade to iOS 7 on my 4S now? I'm going to be selling this phone once I switch. Would having iOS 6 help with resale values or anything like that?

I'd love to use iOS 7 and although I'm not sure when I'm going to switch, if it'll help net me an extra $20 or so I may be willing to wait.

I'm just thinking of the whole AppleTV 2 vs 3 and jailbreak thing.

RoboWarriorSr said:

Running iOS 7 GM on my 4S and all lag has been taken care of. Apple must have worked really hard the past few weeks to speed things up.

I recommend leaving the 4S on iOS 6 since after iOS 7 is released there have been speculation that a jailbreak for the latest version of iOS 6 will be available so people looking to jailbreak can have that option.

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How long should I wait? I'm anxious to play with iOS 7 and I'm not sure when I'll be switching to AT&T. I hope sometime next week but I don't think I'll get any time to make the switch any time soon.