bottom line, a salt pool is a chlorine pool. The salt systems tend not to have as high a buildup of combined chlorine and the chlorine addition is automatic since it is made in the salt cell by electrolysis of the salt but in the end you have a chlorine pool, no more no less.
A PROPERLY MAINTAINED (and that is the catch) chlorine pool will not irritate the eyes, since there will be no chloramines formed.
Swimming in salt does have a slightly different feel to the water (it will be slightly more 'buoyant' and closer to the salinity of the body so it will be a bit less 'irritating' but in the end it is a chlorine pool.

I have a salt pool and would never go back to manual chlorination since, IMHO, it does make pool maintenance much easier (and I am basically lazy)

Stay away from the N2, It's really just a money maker for your dealer (I used ot sell them so I know a thing or two about this).