These are awesome.
I cannot explain how they feel when typing, but I will try my best. What I do know is that it feels good and I love it, on almost anything. I have tried them on tactiles, I have tried them on linears. My preference is to use the M2's on linears and the M1s on Tactiles. With the M1s, the tactile bump feels more pronounced and bottoming out gives a feeling of conviction that you must experience. The return speed of the switch feels like it is accelerated just a tad. If you are looking for something that would compliment the bump better but keep the bottom out feel the same, get the M1 with the force rating I like using the M2s on linears because it gives tham a gradual heavier experience with a slightly faster return comparing the stock switch rated at the same value. It feels off putting because it gets easier to press you progress through the bottom out. Spice things up and give it a try. I havent used anything else since I tried them 3 months ago.
Good springs - No surprises
The springs were exactly as advertised, in good condition, and uniform in size/weight. The size of the opening was not too big, nor too small - they fit on all the stems and housings I used very well. I used a small amount of ISO 100 synthetic oil on them before installing into switches, and have heard zero spring ping. I would (and probably will) buy this brand of springs again.