I've had the program since it was free, and I recently updated the full version. I love the program, but when they did the update, they took out one of the conditions that I used to use a lot, which was the calendar condition. If they added this condition back into, i would say it is worth the 10$ as long as you make a point to use it to the fullest.
For example, atm, i have situations set up to put my phone on silent+vibrate, with a dimmer screen, shorter screen time, and such when I'm in class, and then go right back to normal afterward, i also have a low power situation that lowers the volume, brightness, and screen lockout times plus turns off all of the networking capabilities (except for GPS) once it gets below a certain power level.
I did prefer the only interface more though, but short of that, and the lack of calendar conditions i think its a great app. On a semi-side note, anyone know if they are bringing calendar conditions back to it?