I was recommended to GIZBIZ from a forum and decided to give it a try after hearing good remarks about them. After recieving the BP511 battery for my Canon 10D, I charged it up and left it overnight. Have to say, I haven't had to recharge it yet since December 15th ! I must've taken at least 800 shots with the battery so far and it just wont run flat !
For the price and performance, it's definately worth it as I only get about 300 shots from my original Canon battery. Recommend anyone to try out the ENRG batteries for their digital cameras.