I've had my MX Silent Reds (Pink stem) in a Filco TKL for about 3 months now.
I can't speak for how they feel with stock keycaps because I've had an SA profile set on it from the beginning.
I really really dig the way this board feels with SA keycaps; very satisfying. And although I can't figure out why, they are especially nice when I typed with heavy hand. I guess it's the satisfying slight cushion when bottoming out.
If you need quiet and you tend to type on the heavy side, this should be a nice switch for you.

Now I need to try some silvers! Just need someone to get them in stock.