Tasker experience on G2

I am on the fence about getting Tasker. I wanted to automate Wifi and notification sounds turning off/on and was going to get Tasker, but I found an app called Timeriffic and it does a good job. But I still like the level of customization afforded by Tasker.

MY question is this - if anyone has been using it on their G2 for a while, have you noticed any performance degradation? Also, noob question - what happens when you get an update or something? Do you have to pay again?