So the people selling them want you to buy them.... got it....
I do own an ACT, it is a perfectly fine trigger... but I changed it out for one I like better.
I also have tried a few other triggers. Including gisselle SSA, larue MBT, and AR gold.
Honestly it is a great upgrade, but for me three ACTs was not worth it, as a few hours while watching TV and polishing was a much more personal experience... and when the skill is learned, you can do it any time you want for any future guns.....
Not to be a pain, but I would encourage everyone to take the hands on approach first.
Especially since anyone that has owned ARs will tell you, you usually end up with a few spare triggers. Why not try?
That said... if you only own one and want to upgrade of a budget.... ACT is likely the best way to go.
As a matter of fact, I have recommended them to a few friends, and will continue to do so, as many people don't want to spend the time