if it aint broke, dont fix it.....
ive never had an algae scrubber, but i thought about it once...... tank wasnt fully cycled and had tons of hair algae...but then started researching and found that most people didnt like the maintenance needed and if they slacked off, they would crash...
My opinion is if you have a mature tank, there should be no need for it... if you have a good skimmer and control your feeding, you wont need it...
Ive heard waaay too many stories of people running algae scrubbers and failing due to lack of maintenance...this is the main reason i refuse to use one...because i can forget easily....
I control my feeding, over skim, maintain waterchanges, and run gfo if i see a spike in phosphates... havent had a problem in 7 yrs with this procedure and will continue so as i have had great success....
Also, i dont carbon dose nor will i ever.... just another thing that may or may not work for people...
My theory is KISS.... keep it simple stupid...the more things you add or try may work and they may not....i like to keep the things simple and have less things that can fail... automation fails....every time....