It might at first, going from the browns. I started with Red as my first mech board, then went to 45g Topre right away. It felt tougher to press but I got used to it in about 2 days.
But when I go to the 55g though, I wasn't liking it at all at first. Tried it on off for a week and still finding myself going back to 45g. Then I figure I'll try those 55g domes in my HHKB Type-S so I transplanted it. There is no looking back now. Once you get used to 55g Topre, it is the best typing feeling EVER!