Bought for my mum when she had bad psorisis which was very painful. This soften our London hard water really well the difference was obvious. I can only think that people not feeling a difference live in a soft water area. It is heavy though but rather than putting it on the shower head end one could place it inbetween the source and the hose.
If water pressure is an issue the eco-pulse shower head has helped and overall the combination works well.