Hi Pete,
I took all the courses. I strongly recommend to at least have an ETA 6498/6497, ETA 2801 or a FE96 at hand for the first level to work on. I believe that once these simpler movements become clear and you had experimented enough with them (or with the one of your choice), you'll be ready for more complicated stuff. I personally chose the 6498 because it is a bigger movement and size here has a number of advantages for the beginner. Eventually I'll revisit this level but this time with a 2801 and then convert it into a 2804. Any Chinese imitation may not be fully compatible but some people have use them, IMHO with mixed results since parts are not totally interchangeable and you have to allow for the odd lost/damage part. Those need to be reordered...and that's the prize of learning.
I also believe that the ordering part is useful too since eventually you will need to learn how to identify the parts and where/how to get them, considering prize and availability. So, this exercise is also valid.
Level 2 will move you into an automatic watch so there you have at little more work in addition with the cleaning and oiling introduced in the level. Quite good I should add.
Level 3 will then introduce the Demagnetizer and Time Graph machines, troubleshooting and more.
It is the combination of all 3 levels (about US$225) that really give you the foundation. One advantage is that this is one time payment and lasts forever according to them. There is a very knowledgeable instructor available that will help you through your classes by answering your questions, giving you techniques and tricks, and guiding you when you get stuck on something.
Highly recommended.
Cheers,
Bob