I have used the Lindsay system. It is a fantastic system to use. I am now using a GRS system but it was what was available to me at the time. The Lindsay system is comparable and has its advantages. You do not need electricity to run the Lindsay only compressed air. So in a pinch you can run it from an old car tire or bottle of compressed air so it is much more portable. The Lindsay sharpening system is very simple and user friendly.
I don’t know why you had problems with the GRS system. Both systems are set up to lighten the load and give you a traditional engraving style so it should have been easier not harder on your body.
i can only suggest that it you had issues wit the GRS you will probably have issues with the Lindsay.
I would suggest finding a demo model and give it a try before spending the money.