I'm just here to say that I think the analogy of Topre keys feeling a bit like piano keys is the best way I've ever heard it described. That's exactly how they feel to me too.
Same here, and I actually play piano (as some of you who made the comment probably do too).
@Op - If 45g didn't do it for you, there is a chance the 55g will, since it is more tactile/snappy. But if it's not the desire for an increase in the tactility that's bothering you but the actual mechanism of the Topre switch itself, then having more tactility might not be enough.
I'm one of those people whose initial response to Topre was, "This is it? It's just like a more solid/smooth rubber dome!" It took a few weeks of alternating between a few different switch types to start to really understand why some people claim Topre is the king of all switches, and now I'm a convert too.
If I were to logically explain why someone like me, who is very logical and pragmatic (and even wrote a long rant here at GH about how Topre fanboys mislead people like us about how amazingly better the 55g is compared to the 45g), now thinks the 55g is my favorite switch, it would go something like this:
1) It is more tactile than any of Cherry MX switches. The tactility isn't just this rounded bump like on the Cherry switches. It's sharper and snappier, but not jarring--it's still very smooth. While there are switches that are more tactile than Topre 55g, they will be very noisy (buckling spring), or much more coarse (Matias/ALPS).
2) It is one of the most quiet switches that doesn't require you to do any silence mods or get the silenced version, and is still as quiet as any typical non-mechanical keyboard. Other switch types without some kind of silencing mod will be much louder than the average non-mechanical keyboard. The reason Topre is as quiet as typical non-mechanical keyboards is because it is using a similar mechanism of rubber domes.
3) It is the smoothest switch out of all the switches. It's not the most tactile, but it is unique in that it is the smoothest while still give satisfying tactility (the 55g).
4) Topre keyboards are historically by default, of very high quality (although some might say the recent development with the Novatouch has changed that somewhat. I have no experience with the Novatouch, so I can't say).
There are of course downsides to Topre too, though:
1) Topre keyboards and keycaps are by default much more expensive.
2) Keycap selection is pathetic compared to Cherry MX.
3) There aren't many different variants of the switch like with the various Cherry MX or ALPS switches. You have ergonomic weighted, 45g, 55g, the silenced versions, and that's pretty much it. I think there might be a 30g but I've only seen it mentioned once and I have never seen one listed for sale anywhere.