All is well. Haven't got any benchmark data or firmware revision numbers to compare. Oddly, the light sensor seems slower to react to ambient light changes, which I consider a good thing.
According to an article over on ZDNet: "The Surface Pro firmware updates include fixes to Wi-Fi reliability allowing for better roaming and improvements to "limited" connectivity scenarios; the enablement of Windows To Go feature; and improved onscreen keyboard detection synchronization when going in and out of sleep, according to Microsoft."
I just went to the updates on my Surface Pro and it said there was only an update for the Marvell Wireless networking controller ( or something like that ) so I told it to go ahead.
Well that was strange. I had to restart and then I went back to updates and it immediately told me the firmware was ready to install!!!