I did their Crystal therapy course years ago and it was fine as a basic introduction to crystals for my personal use, but I went on to do other accredited courses with qualifications that my insurance company recognised.
The main question to consider is (as it is with any course) -"is this course accredited and will my insurance company accept it", presuming of course that you want to be insured to treat paying clients.
If you are doing the course for personal interest or as a precursor to doing an accredited qualification then it's probably an okay place to start.
Hope this helps.
Blessings
Helen