coming from someone who has used a mechanical keyboard for the first time a few hours ago:
they're okay, but not quite what i was expecting.
as i type quickly and bottom out, it's true that you can't really feel the tactile bump, however instead it feels like the key is vibrating a little bit. if you've ever pressed finger onto the gear stick of a car while it's running, it feels a bit like a light version of that when typing quickly. that said, i don't really mind it.
another thing, is that i can feel the friction of the switch as it slides down the shaft, which i didn't get with my last keyboard. i think that friction is also the main cause of the sound from the keyboard, other than bottoming and topping out. not sure if i like that or not, but again, it doesn't really bother me.
one thing i really like, is the linear-ness of it (compared to rubber domes). rather than just collapse and bottom out straight (rubber domes), they slide down as soon as i put enough pressure on them. it's nice and smooth until i hit the tactile part.
i don't feel like i had much difficulty adapting to mechanical switches. i've heard people say it can take some getting used to, but i feel like i've been comfortable using it straight out of the box.
i'm sure my opinion will change over the coming days as i get used to the new board.