I have a limited selection of keys to test with, and have not yet fully installed all of the o-rings, but I am finding that o-rings on my QFR with greens leave the keys feeling a bit... mushy. Admittedly, I strike the keys pretty forcefully, so I know that I am bottoming out the keys every time, which is why I wanted the o-rings. More for coworkers than for myself.
Does anyone have any experience with how different keycaps impact the feel of the o-ring mod? I only have the home row done, and am already consider giving up on it, but at the same time am wondering if it isn't in part the stock keys on the QFR, if PBT keys might feel different due to the weight, if it is just how the stock keys feel in general, no idea.
Also finding that the numpad with browns feels nicer with the o-rings, while the QFR with greens feels not quite as good. (Numpad is a Goldtouch, low profile keycaps, really wishing I had gotten a retro dsa kit for it while Techkeys had some in stock.
) For feel, I much prefer greens, though I'm wondering if I could get over the lack of auditory feedback with a heavier linear switch. All of this is to best emulate the feel (force) of the Model M without the noise, without (for now) a floss mod.
O-rings are just the $8 pack that everyone seems to get off of Amazon.