I was able to make the Surface work with the Cicada pedal in a matter of 5 minutes. It's perfect. My chord charts show up in Acrobat reader and I can scroll just fine.
I now have to determine if Adobe Reader will be all I need for my chord charts (I suspect it will be) or if I want up try the GuitarTapp app. I'm not looking for a music creation toy/tool like Garage Band or Boss Jock Studios. I'm looking to display chord charts for professional rock music gigs where I play bass and sing.
I used UnrealBook on the iPad but for what I was doing Adobe Reader or GoodReader would probably have been just fine. Problem was on the iPad none of these worked with the Cicada, I had to get something specific. Also, I had to make sure the Cicada was on first before I launched or it wouldn't find it, and if I switched to another app and needed a keyboard (for example to look up requests on the ultimate guitar web site) I had to turn the pageflip off since iOS doesn't like showing an onscreen keyboard when a Bluetooth one is connected. Then I would have to kill the UnrealBook application, turn the Cicada back on, then re-start UnrealBook to get it to work again. It worked, but not particularly well.
I think multiple keyboard integration, including on-screen keyboard integration while an external keyboard is connected, will be better on the Surface than it was on the iPad2.
Also I'm finding, much to my surprise, that the long portrait mode of the 16x9 display is actually better for this than the 4x3 display of the iPad2 was. Who knew? I would never have expected that. Now I have to order a stand mount tablet holder.
Also - The difference in picture size/quality for watching widescreen movies when compared to my iPad2 is dramatic.
Edit: Just spent some time with it and the Cicada pedal seems to work with my Surface/Windows RT better than it did with my iPad2/iOS. I can switch between Adobe Reader for my chord charts and IE for Ultimate Guitar and not only does the on-screen keyboard come up perfectly in IE, but I can scroll both IE and Adobe Reader with my pedal. And the 16x9 screen is much better for reading charts from the internet than the 4x3 screen on the iPad. I'm impressed. My only complaint, and it's a minor one, is that I can't seem to get Adobe Reader to scroll to the top of the page when I hit "Page Down" on the Cicada. It scrolls continuously. I am going to try to re-format my chart files for legal size paper and see if they fit better. I may need to come up with a custom format.