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Topre switches have a different feel to MX, a different force curve, and a different sound.
I like heavier switches too (clears, blacks, greens) but I love my HHKB even though it is "only" 45g. Topre has more resistance up front, and thus feels a bit heavier than the very roughly equivalent MX switches, say browns.
If you can, go to a keyboard meetup (links usually posted in
off topic) and see if anyone takes along an HHKB that you can try.