We haven't done it yet but are planning to next year. My SIL has a salt water pool and she LOVES it. Definately less maintence and less expense. I believe she does still have to shock but I am not sure how often - I will need to get all the details before we make the switch.
I have swam over there a few times and I will say that love how it makes your skin feel after swimming in it, no drying out like you get with chlorine, and no funky green hair. We've never had any problems with red eyes from it.
Like everything some people are going to love it and some not so much. Everyone I know who has a salt water pool LOVES them.
The only people I have really ever heard say anything negative are the pool supply places, which makes me think it is because they do not make as much money on the salt water pool owners because they use less chemicals