Iphone 5, ios 8.4.1 should I update it to ios 9.0.1?

Okay bear with me I just had this thing and I'm wondering what does jailbreak mean? And should I install ios 9.0.1 although some say it's laggy i need answers As soon as possible thanks.

I would wait another month, thats what I do before upgrading any iOS even when its free. Unless there was some major feature I really wanted, and iOS 9 does have some good features added that I want, but I'll wait a while first.

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