The driver for the 1818 works fine here with no glitches... The Virtual Studiolive software which is part of the driver is elegant, efficient and well thought out...
I don't know what the surface is... I'm guessing it is a Microsoft tablet? If you can run Sonar on it, the VSL console will give you full control of the 1818... It's almost the same as the Studiolive software....
Yes, they also include Capture and StudioOne Artist... A good entry level version. It works well and has many good ideas, but I prefer Sonar by far (version2version comparison)...
Capture is another story... Just for recording, not editing... Turn it on and all inputs of the available device are mapped 1-1... Click arm and press record and your multitracking... Afterwards simply insert start and end markers for each song and use their command to chop all tracks and export the separated songs for import to your DAW of choice... This is great for live gigs so you can press record for each set and capture as many sets/bands as you need very easily...
The wifi stuff is easy if you have a router... Then you have walk around control via iPad...
USB does just fine for the interface. I have not tried using theme USB line for external drive recording though. I did that while FireWire connected the Studiolive... You might want to use a separate USB line... Most pc's have a number of connectors sharing two actual ports... I don't know how you deal with drives/storage on the Surface...
The Focusrite are fine and I've installed a few of them too... I didn't like their console view as much and all but one are FireWire...
I find the Presonus more of a transparent preamp and the Focusrite a bit colored...nicely colored though much like their analog gear of old. The Presonus FatChannel is excellent though the 1818 compressor doesn't do soft knee...
I forgot to mention... Be certain you have USB 2 for the 1818. It does not do USB3 at all... And I did gave one machine that had a lot of trouble with the 1818 and sounds like what P-Theory mentions... But that was only one of the 5 machines I installed it on... The Studiolive worked well on every machine as long as the FireWire chipset was right...