We decided to go for a soft/medium/soft mattress (instead of the firm one). At first we thought it might be too soft for us (after using a futon type mattress), but we very quickly got used to it. We sleep very well with this new mattress. Just recently I realised that some lower back and sciatica pain I’ve had for years has simply disappeared. I haven’t changed anything else so can only assume it’s the mattress.