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YES, can't see why anyone wouldn't. I just run a handful of tweaks but it makes me really love my 6+
 
I recommend you see what tweets are out there and how they interest you. More than half of the battle is just knowing what they can do for your phone and improve your experience.

The remaining less than half is having the ability and jailbreaking while you have a chance to.
 
If you like playing around with your phone, such as theming and apps that can allow you to do things that Apple won't, then yes.

If you are happy with what you have right now, then probably not.

I am always looking for ways to play around with my phone, so I JB whenever I can. I remember "cooking" ROMs back when I had a PocketPC...
 
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