I have asked this very question more than once. I received it in a trade months ago for my daughter and then traded it away. Only to want it back. I have talked about my neck and shoulder issues in reference to nerve damage, but somehow I still wanted to try it.
I purchased the set from BB in early Feb. I have committed myself to following the modifier for the first 30 days. I am into week 3 and so far so good. Yes, it has a lot of shoulder work in it. I push myself hard and then stop when I feel my form is compromised. I get on my Simply Fit Board and finish out the time. I'm learning to be patience with my body. My neck and shoulders are responding well and feel stronger already.
Key to this is watching the tutorial on the first disc. She does a great job explaining the how's and why's. I really learned quite a bit about body position, etc. I also took the time to measure my body.. not just weighing myself. So that at the end of the first 30 days I can see what's going on overall.
I have goals I want to meet for sure, but for now, it's the first 30 days I'm focused on. Good luck deciding.