To be fair, let's give Modafinil some benefits of a doubt on the premise that it could be worthwhile. This review includes the features, benefits, variants, FDA-friendliness, dosage regimen, and where to find Modafinil if you eventually decide to use it. 
So you are looking to take modafinil or just probably need to clear your doubts and come up with a solid conclusion on this bio-hacking agent. Isn't it?

No worries, it's always the right thing to do whenever you need to be 100% sure of something, even essentially as this relates to your overall daily cognitive health principle. Make it or mar it.

If you have never heard about focus-enhancing chemical formulas, I guess you've been living in Pluto or Mars for quite some time now. Lol! Just kidding. The fact is, brain bio-hackers are so popular as anything else in the health arena.

In this present century, which is characterized by modern technological and scientific explorations, there is always a need for humans to adapt and keep up with the pace of these changes.

It's no surprise that a countless number of focus brain enhancers are already promising to transform your brain into an advanced human 2.0 version of yourself.
More at: https://www.neuroscientia.com/2018/11/modafinil-focus-smart-formula.html