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This review started off as a five star two weeks ago, but things have changed. The first problem took the form of erratic "remaining capacity" readings from my Canon EOS 7d. It might read 65% after a shooting session and then magically return to 100% after sitting around for an hour or more. It would, however, return to 65% after one or more shots, so I decided to live with this and did not change my review. A week later, it does not fully charge on my Canon charger. After charging overnight, the charger lights were still blinking and the capacity read only 57% in the camera. This has now happened twice. Most recently, the battery failed in the middle of recording a 10-minute video clip when it should have had plenty or capacity left. I haven't decided whether to go through the hassle of asking for a replacement as I don't know if the replacement would be any better. As much as I hate to pay Canon's inflated battery price, I guess I'll stick with them. Too bad as this looked like a really good deal. Update (7-25-2012): After two months, I decided to give Sterlingtek's one-year guarantee a try and called their customer service to find out if it was worth the trouble. They sent a replacement the next day with no grief or hastle. It arrived by Fedex Express and has worked perfectly through three recharge cycles. Given their guarantee and responsive customer service, I now consider the price to make it worth a try and would recommend buying directly from the company. I will update this review if the replacemtnt gives me problems.