My experience with the Energy has been a positive one. While the mouse lacks a lot of the "feel and comfort" that gaming mice afford, for what it is, it gets the job done, and is much simpler than using a track pad. I can say that while using the Energy, or on the road with it in my pocket, when it came to using it, the rubber grips saved it from falling out of my hands. I did not use it for prolonged gaming sessions, as that is not its intent, but does have a lot of Spider Solitaire hours on it, it was my main browsing mouse for a week or so, and overall, it works very well as a basic mouse, and being wireless is perfect for those on the go, less to forget or lose.
As for its charging capabilities, we are pleased with our testing. While the charging of the Energy mouse from ten percent charge up takes close to two hours, you can still use the mouse while it charges. Plugging it into the Galaxy S3 it adds a full charge to the phone in roughly forty-five minutes. Not too shabby, and this was with the phone powered on during the charge. It is some ten minutes faster when the device is not running. I also exceeded the limits of the Energy a bit, and went ahead and tried to charge the Nexus 7 tablet.
While it did not complete a full charge, we were able to add another sixty-five percent to the battery life in around an hour. A cool added feature is that the discharge will stop at ten percent life left. This allows you, if the charger was used, and the phone is dead again, to still get on Facebook to finish up and remain in contact for a short while before the device is completely dead.
Even though the pricing varies quite a bit depending on where you decide to buy from, the $30 U.S. dollar average pricing is really amazing to me. For what you are given, the mouse is worth most of this money alone, just on the 2.4Ghz wireless ability, basic functionality, all as a travel mouse. But that isn't where it stops. The fact that you can put a full charge on your phone with this device is pretty impressive, since if you are traveling, you already have a mouse going too. Why not have it be a mouse one day, a phone charger while on the go, and as long as the PC it charges from has sufficient power, you really should never be left in the dark with a dead battery.
The fact that it can slip into a pocket easily may look a tad bit odd, but even if you do get strange looks when using a mouse to charge your phone, those who don't have one and their phone is dead, will think this is the best thing since individually sliced cheese.