When I got the surface pro, I was disappointed in the klunky power supply. Has a separate power cord to go from the power supply to the wall, and I like this one, designed more like the Macbook Pro power supplies I'm used to these last three years. So when I saw the lower power one for the RT, and verified from the MS documentation that it will work with the Pro, I decided to get a couple of them so I could leave chargers at work and at home, and have one for the bag. The charger physically is smaller, and the only length you lose is that extra power cable needed from the brick to the outlet on the larger version - the cable from the brick to the Surface is the same length. And in most cases the lack of that extra foot or so of other cable is offset since this one doesn't have to then drop to the ground since that's where the larger power supply has to sit. With the cable coming straight off the wall at home using this one, I have the same reach since I don't have the power supply getting pulled down by gravity to sit on the floor under the power supply (or being forced to be suspended in mid-air). I wasn't too concerned with it taking longer to charge the surface since I'm generally near an outlet if I need to use one, but my testing has proven that it's not even a concern. It took my Surface Pro just under 2.5 hours with the supplied larger power supply to recharge from the couple percent "won't turn on anymore" point to a full 100% battery. When I tried it again with the RT smaller power supply, it took me the same amount of time. I haven't done any testing yet on the tablet in use while charging, since that may be the scenario where it doesn't charge as fast, but that's not a concern for me anyway since in that situation I'd have power supplied to it regardless of which supply I am using so if it charged faster or slower wouldn't be an issue for me. So for the fact that it charges a sleeping Pro just as fast as the original larger power supply while having a much smaller and easily carried form factor, this is a definite win.

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