No, I dont have them in any of my tanks as I like my systems to be crystal clear without some distracting wall of bubbles coming out of nowhere.... I have plenty of surface agitation from my filtration returns and oxygen levels are high so no need for them.
For a very small outlay, air makes an excellent backup support system. I have quite a few tanks, mostly on large and efficient central filters yet they all have air/box/sponge filters.
i have bubbles in my 100G tank... they are starting to annoy me and look childish...but its good really because i'm planning on using the pump to power my skimmer
but i will get a powerhead for the 100G
in my 10gallon tank with 2 bronze cory....i like the bubbles because they like to swim into them and they don't bother me as much
I don't have any air on any of my show tanks. I do have a large air pump to run all of the sponge filters in my breeder tanks in the basement, though. Much cheaper than running a ton of HOB filters.