watchOS 4.2 only had a few fixes that didn't affect me, but boy its so much more responsive and back to 3.x speeds for me on my Series 1, and iOS 11.2 was the same way so hopefully 10.13.2 is the same way as the others.
It won't install on my 27" iMac (late 2015). It initially said it was a 1.66GB download, then rebooted to install, then quite quickly returned to the login screen and said it was unable to install the update. I tried once again, and this time it said it was a 1.18GB download. After rebooting it hung for around an hour on "calculating time remaining". I powered off/on again, and it booted to a grey screen with a little Union Flag in the top right hand corner and said something along the lines of not being able to find the OS. A further reboot seems to have returned it to 10.13.1 with everything working OK, phew.
Does anybody have a download link for the full 10.13.2 installer? I had a similar problem with the 10.13 Supplemental Update which was solved by installing from the full installer.
I had no problems with the 10.13 -> 10.13.1 installation...