We also had a Kinetico, about £1000 installed (
) but with a non-softened drinking water tap plus filter on it. My outdoor garden tap is non-softened, too. It's all plumbed so we can take it with us should we move.
As stated, it uses block salt (20 blocks for £80 off ebay), a pair of blocks last us 10 days.
We were hoping we'd see improvements in DS2's eczema but, tbh, we didn't, but we know our Megaflo cylinder will never lime-scale up and gradually the softened water will de-limescale the radiators.
Be aware that, after using hard water to shower etc, the slightly slimy feel of softened water can take a bit of getting used to. If I do a quick post-gardening hand wash in the sink, I often rinse with the drinking water tap as it gets the soap off far more quickly!
I am not entirely sure I'd spend my last £1000 on it, tbh but I don't actively regret it.