I use Zephyr and I'm on a 4S on 5.1.1. Absolutely love it. I disabled it in most of my games because I was constant swiping out of the game but once I got that sorted out I havent been disappointed once. When I was finally able to jailbreak 5.1.1, I too noticed the price went up substantially. I paid the $5 for it but it's a "staple" for me like lockinfo and bitesms. So I don't have a problem paying a premium for something I use every single time I use my phone. Plus if that's motivation for the developer to continue to update and innovate, well I'm perfectly happy paying. I prefer not to spend money on software that is poorly supported but the devs behind these three mentioned apps are all very responsive.
I highly recommend Zephyr.