I worked side by side with a lady who used the Earthlite and I must say it is a beautiful chair. She even worked on me, on it. And, it was very comfortable. It has a few more plastic parts than I prefer. I do recall the Earthlite has a little "spring" to the chair which the Stronglite did not, so that when I was working on her (we swaped out so I could get a feel for it too), on her chair, the chair sort of gave a little under my pressure so that pressure on the back, caused the body to sort of spring along. It was a little uncomfortable feeling to work that way, just because I am used to no movement, but I think it may be nice to the client as a gentle "rocking".