Are buckling spring switches louder than blues? And are they heavier than Topre 55g?
Well, it's a yes for both questions!
BS are famous for being really loud. That's what we like about them!
Buckling springs on the IBM model M (it's a little lighter for the Unicomp's M) are around 75/80g if I remember right.
On other boards, as the model F, they can be lighter.
They're more heavy than Mx Blues, that's for sure!
If you ever try one, coming from a light switched board, it'll be a little difficult to adapt at the beginning but well worth the efforts

Then again, some says that 55g on some switches are more tiring than 70g on other switches, so maybe you'll not have problem with that...