A friend of mine got one, seems to run stable in general and range is certainly better.
I've ordered two myself to compare the Linksys MR8300 ones I have. I think they're mainly interesting because ARM64 is a much better platform (including crypto extensions), SoC development seems to be progressing more than IPQ4*** (which works nice although there are some issues with the ethernet related subsystem) and WAVE 2 11ac should be fine too. The DIR-860L isn't bad (MT7621) but its starting to show its age and interest is declining so I would expect more issues further down the road.
Gave it a spin today, the included PSU feels really cheap (fire hazard-ish level) so I replaced that another one but other than that it's seems to perform really well. Compared to Linksys MR8300 it seems to have much better performance. I have two connected via WDS between two floors and the Totolink performs about 3 times better than the MR8300 downstairs (~95mbit vs ~270mbit). Hardware crypto also seems to be working although I'm not sure if that also includes the official snapshot images (GCC documentation is a bit unclear about what it enables by default by setting -mcpu=cortex-a53) since I compiled my own image (OpenSSL with all optimization enabled, -O2 instead of -Os for global optimization and lastly enforcing hardware crypto extentions, -march=armv8-a+crc+simd+crypto -mcpu=cortex-a53+crypto vs -mcpu=cortex-a53). Seems to have a very good bang for the buck ratio! =)
Firmware/Image based on commit: https://github.com/openwrt/openwrt/commit/dc2da6a23369c8da069321dcfd593a9cf8c993c6
just to let you know that my TOTOLINK A8000RU converted to OpenWRT is amazing for the price (82€)
i didn't notice any bug, the wifi is very strong and works very well. if you want more info don't hesitate.
btw the manufacturer Firmware has a lot of hidden page, including one that enables telnet : http://192.168.0.1/telnet.html
telnet and ssh password is : cs2012
the only negative point for me is its size, it is really huge