There are a couple reasons I haven't bothered using SS frets in anything yet.
1. In a guitar like the Parker fly's with the carbon fretboards, you have a material that will not contract and expand much if any. The frets will never move. In wood they can move, they can pop loose, the frets can become unlevel with wood movement etc. This isn't the end of the world, but it will mean an expensive levelling.
2. Stainless is very hard to work with, in the event that a fret isn't dead level it is major work to level it out, it's also major work to dress the ends, not impossible, but much more time consuming.
3. The feel, I get no response from them on my Parker, it is the one thing about the parker I have never liked. They feel cold, they are to smooth I think, well for me anyway. The brightness isn't an issue, I just don't like the feel personally.
But, that's just my two cents