They have a nanodegree class that is much better. I have been taking it the past two months and I highly recommend it https://www.udacity.com/course/deep-learning-nanodegree-foun...

What areas have they improved in?

I was really disappointed by multiple Udacity courses; not saying they can't pull it off, but I've been burned enough by Udacity that I wouldn't consider paying for any courses from them at this point.

Yeah, I took most of the "AI for self driving cars" course taught by Sebastian Thrun himself, and was torn.

He's no doubt an extraordinarily competent researcher in his field, but he was clearly a beginner to Python (either that or he didn't care), and the Python code (while bringing the concepts across) was so poor as to be distracting.

I have watched a lot of Siraj's YouTube videos. He is a very entertaining speaker, but never felt like I actually learned a ton. Is the nanodegree on Udacity better?

it's very poorly organized. I'd say you get maximal utility out of it if you're like me and for some things (I don't always do this) have to pay for the privilege of being pressured to do something to completion, and are reasonably confident you can figure things out yourself (good maths background, minimally "modestly capable programmer", maybe have tinkered with ML).

Hopefully future iterations will be better.

I have taken a 'certification' and a 'class' with Udacity and I wouldn't recommend it to anyone. The courses are shallow and do not challenge the student and the certifications hold no significance.

I prefer EduX courses as they are more like 'classes' and I feel are slightly more respectable to put on a resume.