Excellent course with some tech glitches that are being cleared up.
1) Outstanding lecturer in terms of both ML and Finance
2) Real substance to the course - e.g. I do ML in finance and have for some time, yet I found this "guided tour" to offer some real opportunities for thinking and working.
3) I think that compared to ML classes that use toy problems to illustrate ML algorithms, Prof Halperin sets up the problems so that students have to figure things out. This is an uncommon practice, and I welcome it, but not everybody will.
For example,there was an assignment involving censored regression that required students to actually do some research - like, searching google or Wikipedia to figure out the special characteristics of the regression problem being posed, and relate it back to the code. The kind of thing one might expect in a college course. This stands in contrast to spoon-fed projects and assignment that are common in MOOCs. This is unfortunately mistaken by many students for an accident (it did not help that there were some technical glitches with grading early on). It's still easy in terms of poblem-solving in contrast to many Quant MBA -tyype courses.
So, for people who want to get a Certificate that they know ML for Finance without doing much to earn it, this class may not be what they're looking for. Those who want to learn a bit, and do so under conditions intended to offer some features of real-world applications, will be rewarded.