Router Model TP-Link TL-WR841ND v9
Firmware Version DD-WRT v3.0-r38937 std (02/23/19)
Kernel Version Linux 3.18.136-rc1 #33973 Sat Feb 23 05:36:36 CET 2019 mips
Issues: None, so far.
Installed and running fine on my DLink DIR-862L so far.
I've previously had issues with intermittent Wi-Fi (Wi-Fi connected, but no data flow) on the 2.4GHz channel with various other DD-WRT builds - usually a disconnect/re-connect attempt on the client or a router reboot will fix. Some DD-WRT builds seem worse than others. I can't rule out a hardware issue, however.
Update: upon further testing, experienced data lag/failure - CPU was reporting 100% usage. Reboot fixed, but reverted firmware to an older version.