I tried one early on, on a Martin 00-28VS as I found the forearm edge sharp and uncomfortable. It was okay. It gave a more rounded edge but at the cost of adding thickness to the surface. I sold the guitar with it still on so I don't know if it was removed and how that went. I did not notice any improvement to the tone although in recent years I have found that raising my arm off a wood topped guitar does in fact improve the tone and sustain.
Then I went over to wood and CF guitars with bevels and really liked the comfort factor. But then I came full circle back to non-beveled guitars, both wood and CF. I don't notice the edge issue anymore because I either play with long sleeved sweatshirts or if I'm in a T-shirt I'll use a cutoff sock on my forearm because I don't like the feel of skin against a gloss finish guitar. It also helps keep that forearm 'smudge' from happening and provides a little added comfort from guitars with sharp-ish edges.
The RainSong is slightly rounded so that's not an issue.
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