[j_bum]

I keep wondering this too.

I’ve been tempted to try it because I tend to view HN as an organic place, and I’ve seen it pop up on the front page so many times.

But I have ultimately hesitated to try it because it feels like a suite of targeted ads.

[sandspar]

For what it's worth, I've tried and I loved it. It feels a bit like grinding Anki flashcards - nearly 100% of your time is used productively.

[j_bum]

Did you use it in a goal oriented way or just for fun?

I’m hoping to solidifying some previously learned ML maths skills (mostly LA & calc), but also want to expand my stats knowledge. I’m thinking of trying it to see if it piques enough of a passion to shift into a more ML oriented role.

[sandspar]

I did it for several months for fun and enjoyed it.

They use a placement test to figure out where you'll start. They offer a college level statistics course. And you're in luck: their marquee course focuses on ML math.