Just received my Power Cover from UPS this afternoon. BatteryBarPro tells me the cover has 23,337 mWh and the Surface Pro 2 has 42,010 mWh. So yes, about 70% increase in battery capacity with the cover on. First impression is that it is thicker than the Type cover 2, almost 2 times the thickness of the current type cover 2. It's shaped like the size of the original type cover but with the type cover 2's matted skin. Overall feel, the typing feels much better and very solid when compared to the current type cover 2 due to the fact that there's the solid battery under it acting as cushion. Type cover 2 is already nice to type on, but this is like typing on a hard surface, very stable and solid. It's a joy to type on it even when compared to the type cover 2. The mouse pad is much much easier to use too because it is resting on top of a solid battery. The cover no longer bend when using the mouse pad. With the Type Cover 2, I'd still choose to use the touchscreen, but the power cover mouse pad is more usable. The Power Cover is not backlit, so the keyboard light buttons were switch to Mute, Vol Down, and Vol Up. Despite no backit, volume buttons more useful in my own opinion. And want to add that only the Caps lock got backlit indication, but that's all. The power cover gives out heat when in use as the Surface depletes the cover's battery. However, only the bottom of the cover feels warm when under use and the keyboard on top stays cool. I hope it's not going to cause any problems in the future if they use good quality battery. I really don't want to see overheating power covers catching on fire. You cannot charge the Power Cover separately. The only way to charge it is to attach it to the Surface tablet and charge the Surface with it. And by look, the attached powercover seems to charge slower vs the tablet itself. But the good thing is, the tablet and the powercover charges at the same time, so you don't have to fully charge the surface before it charges the powercover. Also, I'm using my Surface Pro 2 with the Maroo case and the Power cover fits in it like the type cover 2, despite the addition thickness. I hope it does not affect the cooling of the powercover under long use, but that'll have to wait for longer usage to really know. Sorry, I haven't tested the full battery runtime because I'll just wait for others to do it. So far, very happy about the purchase and I do recommend it. Now I'm debating to keep the type cover 2 or return it since I only purchased it not long ago. Please add on your own review on the Power Cover and let us know how you like it and if you have encounter any problems using it.