I also own a couple of Microsoft docking stations - one at home, and one at work. The SP3 pops out of the Urban Armor Gear easily, to use either of these docks.
I know this pile of accessory equipment adds up in cost - but the first time I took the SP3 with me overseas, it all became worth it. Plus, being able to set up a docking station in a hotel room is a wonderful convenience.
For me, the SP3 replaces:
- a Dell Precision T7600 monster desktop (number crunching and databasing)
- an iPad (entertainment and email)
- a MacBook Pro Retina
- my worries about the future of Microsoft with a very positive outlook