The sound output device automatically switches when connected to the dock and vice-versa.
The dock won't solve your multi-monitor scaling issues - you'll need to buy a high-DPI external monitor to completely alleviate scaling problems. I have a 27" Dell P2715Q 4K monitor attached to the docking station; at 4K, the resolution is high enough that it uses the same DPI scaling percentage as the Surface's screen. In short, I don't have any scaling issues with this setup and I'm finally happy! You can even run two 4K screens by using the dock's connector plus the Surface's connector (I actually tried this today).
Thanks, forsure not gonna buy it cause if I still have to sign out and back in each time, then its pointless. Besides I would want to run my 2nd monitor on the SP3 Mini DP and from what I see you would have the vertical latches of the dock wide so that the mini DP plug can plug into the SP3. Looks like bad design choice to me. MS should have had the port go right through the right side of the dock latch.
Afterall, plugging and unplugging 4 cords for me isnt a big deal and it takes me 5secs. Just the scaling issues, having to sign out each time and the sound output is whats really tedious. The sound I just dont get how the SP3 fails to convert to ext speakers when it reads that they are connected. Like wtf is that? Really hard to believe that this is a 2015 computer with a 2015 OS.
I have great monitors and im not going to go and buy new monitors just for the scaling issues. I even tried my SP3 on my older two monitors and same thing. This issue is hugely widespread and Ive never had an issue with scaling when I had a mac, running on these same monitors so **** MS. They can kiss my *** as far as Im concerned.