I think Model M bs is a bit stiffer than the 55g, as the 55g just "feels" lighter. Sorry, I can't compare to 45g, but coming from bs, it seems easy to adapt to, and given how this feels, I'm not sure that I'd want to go lighter. What is funny is that the Topre feels "faster" for typing. I'd need a comparo to measure if that is real, but it sure feels like I'm racing along. I like the freedom to bottom out, which approximates the action of bs, although they certainly differ in detail. Plus it is way quieter, with what feels like a thin cushion at bottom. And am liking the TKL form factor for desk space reasons. Can't offer any impressions re gaming, as I use consoles mostly. Overall, it's a pleasure.