Installed it yesterday, no issues so far but if there are any bugs, they usually take time to reveal. Fortunately, the improvements in startup times that came with 3201 in my case have been preserved so that's enough for me.
Update was fairly smooth - it took only one restart unlike the the three restarts needed for the previous 3xxx versions that made my hair stand at an end.
I am kind of lazy person and usually enter BIOS only to punch the CPU multiplier for OC so I can't say if there are any noticeable changes in the menus. Kudos to ASUS for the detailed changelog, though:
"1.Improved System Performance
2.Modified OA key function in legacy OS
3.Fixed some PS/2 devices connection issue in win8/win10 when fast startup is enabled
4.Fixed chassis fan’s behavior after wake up from S3
5.Fixed CPU(i3-7350K) ratio item missing issue in SW"
Given the usual 18-month support cycle for BIOS releases which I noticed about the previous chipset generations, I wonder if this is gonna be the last BIOS for the Ranger. Naturally, ASUS have to focus on their new Intel and AMD Mobos now.