The only con to creating a restore disc of your own that I can think of is that it doesn't allow you any flexibility to upgrade, unless you update your restore disc everytime that you update a driver, install a new peripheral, etc.
Forinstance, the computer that I use has a restore disc that is absolutely useless to me, since I have replaced the processor, video card, sound card, modem, CD-ROM, have upgraded DirectX along with many other processes, and flash updated the BIOS multiple times. (Not to blow my own horn, but this computer can blow away most middle priced systems that are advertised, and it's 4 years old.)
If you feel that you can keep up with your improvements to your system and create a new restore disc every time, more power to you and good luck.

Ouroboros