Simple truth is, for raiding you need this or DBM. I prefer Ace2 mods so this one wins.
Ace2 is the difference between updating addons every week in 45 seconds or going through 2 hrs of hell after a patch and having out of date addons for the next 5 months
It's allowed me to customise my UI without the fear of updating and it has changhed my gaming experience quite a bit.