Hi:
RA and I have been battling for a long time. We've had 3 mattresses before the water bed arrived. My hubby sort of liked one of the spring mattresses but I felt that they all hurt my joints. I loved the water bed, no pressure.
Then we bought a house and hubby said, "No more water bed". He was afraid it would leak in our new home. Although, it never had before. He bought another spring bed that I hated. Since he had hurt his back and shoulder, he wasn't happy with it either.
Then we bought a 4" memory foam topper for the spring mattress. It costs less than the whole memory foam mattress. We both love it and sleep much better with no stress on any joints or other body parts.