We are planning to install one as we're in a very hard water area and are fed up of the build up of limescale we get on kettles, taps etc.
So, if you have one, does it work well?
And OP is convinced it makes the water unsafe to drink. (We will have a diverter tap in the kitchen so we can still get hard water if we want it.) I think that if soft water was unsafe, people in soft water areas would be keeling over right, left and centre, but OP thinks artificially softened water is different.