Hey there,
I decided to bite the bullet and upgraded my TP-Link TL-WDR4300 v1 router to a LEDE (yes, I know it's OpenWRT/LEDE now), using a sysupgrade image. I half-expected everything to go wrong, but luckily it went rather smoothly.
I was thinking I was going to lose the LUCI web UI, but to my surprise it stayed installed. Only thing I lost is some custom packages, which were quickly reinstalled. Is there any "cleaning" I should do after the upgrade (old config files, old packages) ...?
Cheers,