Yes, most GhostBed mattresses are good for sleepers with back pain, but our top recommendation would be the GhostBed Flex.
Sleepers who suffer from back pain are generally going to need two things:
Firmness + Support
The exact cause of back pain may vary between sleepers, but one of the most common causes is when the spine in not properly aligned.
Selecting a mattress that maintains proper alignment of your spine, pelvis, and neck can help to reduce the risk of back pain.

Concerning firmness, the GhostBed Flex is slightly firmer than the GhostBed Classic and GhostBed Luxe. This gives the advantage to the GhostBed Flex since firmness helps to maintain that spinal alignment I mentioned above.
In addition, the GhostBed Classic and GhostBed Luxe are both foam mattresses— the Flex is the only hybrid mattress. Hybrid mattresses typically provide exceptional support and are a solid pick for sleepers with back pain.