Nice next question to ask is about QoS is it good for gaming, currently having issues with 1300ms bufferbloat on current TPLink W8980 (W9980 Firmwared) router.
Been looking at PC World and they are currently out of stock only CCLOnline has them instock like
it should do wonders for gaming.
The asusWRT QoS only helps on upload bloat tho, but luckily thats the main cause of bufferbloat Bufferbloat on the downstream is much less severe.
Some additional comments.
When I first tested asuswrt QoS it worked fine on upstream, but however all my latter testing in the past 2 weeks it wasnt reducing bufferbloat and I pinned it down to excessive sfq queueing.
Now I am on sky which does not use the horrible pppoe, the issue is gone by magic. However I am still baffled as it did initially work fine for me on pppoe so try it and then run a bufferbloat tester like dslreports speedtester.
I have now made a shaper bash script, utilises tools already on asuswrt but using manual configuration I did based on documentation I read and I had upstream and downstream shaping working on pppoe fine (also is fine on sky). If needed I Can share this script. Bear in mind tho when removing bloat on the downstream your connection will become much more "polite", so in situations such as isp congestion you will likely see much lower performance, and the line wont ramp up to full speed as aggressively.
Also I have been working closely with the developer of this fork of asuswrt, and he has been working on the built in downstream shaping functions.