Battery Grip For Canon Vs. Ac Adapter

I read a post about someone's camera getting fried by an AC adapter that may have malfunctioned. It can happen and perhaps buying a name brand vs. a generic adapter may help prevent this.

But for years I used a battery grip on one of my old SLR's and with the cheap cost of AA batteries it provides one with a solution to a dead rechargable battery while in the field if you don't have extra rechargable batt's.

Anyone use a grip on their Canon EOS? The runtimes should be better than a rechargable batt. Prices vary depending on brand but they are pretty cheap.