I haven't noticed any drain. But, then, I installed Smart 3G+LTE yesterday. That aside however, how much drain can there be really?
This tweak only functions when the screen is on, and then only when you're on your homescreen or lockscreen. A majority of JB iPhone users and even regular iPhone users shut their screens off the moment they hit the sleep button (I don't, I'm using Sleep to Lock). So, the only time you'd see it active on the lockscreen is when you check the screen or a notification/call comes in. If you are using an app, your homescreen isn't active.
Honestly, I don't think this tweak is sucking any noticeable power at all. Unless you're just watching the animation for a period of time.