I have been a customer of SterlingTek (STK) digital camera batteries for years and they haven't let me down yet. I bought this battery for the Sony DSC-HX30V. The camera came with a Sony NP-BG1 battery, which shows the power level remaining as a power bar icon. Sony has since replaced the NP-BG1 with the NP-FG1 InfoLithium battery, which allows the camera to estimate how much life is remaining in minutes. It's not clear in the product description, but this STK battery operates like the InfoLithium battery in my camera, displaying both the power bar and minutes remaining.
I cannot comment on the life of this battery yet, as I just received it. If my previous SterlingTek purchases are any indication, this battery should last at least as long as the Sony OEM batteries. I'll post a follow-up after I've had it for a few months.