Sorry, but i had to uninstall...
Why am i going to pay for 3G or 4G and have some service turn it off? Yes it might save battery but I see as it is also taking away things that I am paying for! Yes they come back on or what not but I really didn't see a difference in battery at all. Then we are already having radio issues with this phone and now you're having them shut off ? To turn them back on it takes a couple of seconds too, and sometimes it gets frustrating. I tried it for 1 whole week and while it gave me a "x1.56" there was absolutely no difference. Sorry folks but if you are buying an Android phone you should know that due to the power they have they will consume a lot of battery.
Example; iPhone hold better battery, but that simple, it doesn't support flash, widgets, push email, gps navigation, etc... same thing for blackberry, now put those things on any phone and i guarantee you it will see a HUGE battery difference! I am ok with it because i know I have a very powerful device so it makes sense.
Its like Android is a Ferrari, and iPhone is a Mustang the Ferrari uses more gas, and heck even way more if you press on the gas at full throttle, but if you drive it right you save more gas as well. Same thing with Android, you just have to now how to manage it.
Use the app, but I have been an Android user since the G1 and really i know how to handle and manage my battery saving features. Therefore I see no difference.