I paid $12.99 for this one (in the US), and it's taught by a CFI/CFII. I'm about halfway through it, and it is pretty thorough. Normal price is much higher, but Udemy has sales all the time. I've been involved in aviation for more than 15 years (though not a pilot), and he seems to be ticking all the boxes.
Looks cheap enough on the face of it. When I did my course with a company called RUSTA it cost me £900 but that was a few years ago. I imagine that prices for these courses have come down this last couple of years and it may be that the cost of this course is more in line with the costs that companies charge these days?