Not for me. I have smallish hands, though, so I don't want the extra bulk or weight. My K-7 battery will run a full day to day and a half in WDW, however, depending on flash usage (very light and usually turned down anyway). I simply don't need it. I carry an extra battery in my bag and charge the drained one overnight in the hotel and always have two with me - both of which can last a full day easily. If your battery doesn't last as long or you have big hands it might be worth it for you.