Giving power to MCU upon button press - Good Idea?

Hi
I would like to make a transmitter using a module and my PIC12F635. I know PIC has special functions to stay in power down mode.

But I would like to ask if anyone has tried or is it a good idea to interrupt the power suply of a PIC like supplying +Ve only upon button press? Does doing this can effect its life or performance? Thanks in advance for your replies

Should not be a problem.
I have a similar gizmo. When a button is pressed and held the PIC powers up and a signal is sent and waits for an answer. When a good signal is returned an LED flashes telling me all is well. Let go of the button till the next time.

This all takes about a half second.