Super easy to install, full-featured, lots of lists to pick from, auto-updates lists, no need for an additional device, and you will benefit from router features produced by the openwrt community and maybe unavailable in your router proprietary firmware. Much recommended.
If that sounds attractive and it sounds like a good opportunity to change your crumbling unpatched router, the question "what's today's good cheap router running openwrt without trouble?" is frequently answered by https://www.reddit.com/r/openwrt/ :) .