On regular NS frets... I can easily tell the difference between the 6105 and the 6230. To me its night and day. I can play ok on either, but the 6105 feels a bit better and is easier to bend on.
The 6230 lets my finger touch wood (if I get heavy handed) when I play - while the 6105 does not unless I REALLY press. Beginners may have a problem with tall frets if their touch on things is rather heavy - pulling the string out of tune by over-depressing at the fret.
Having said that - the 6115 seems just overboard tall to me. Dont like it at all... your mileage may vary.
The Stainless Steel frets... are like buttah to bend on. You CAN nick them with strings if you whack a string onto a fret, but you can do the same with NS frets. If you do, it polishes out easy, same as NS frets. Other than that - they seem indestructible.