I finally jailbroke my iPhone 4S a few days ago so I could install MiWi. I have noticed that the battery life seems significantly impacted, and the phone behaves oddly from time to time. For example, today the Zipcar app insisted it didn't have a network connection even though the phone was showing 5 signal bars and "Verizon 3G". I had to toggle the phone in and out of airplane mode before Zipcar started to work again.

The Maps icon is sometimes a blank gray square.

The Find My Friends app refused to work at all until I uninstalled SBSettings.

I'm not entirely sure it's worth it...

What have been your experiences with this? Did you find a way to fix the oddities that cropped up?