Yeah, Topre's are definitely smooth rubber domes. They just feel linear compared to regular rubber domes. I personally don't care for the 45g keys, and under. They are way too soft for me, and I gave my first Topre to my wife (which I occasionally still use). I find the 55g to be perfect for me. Comparing a cherry board/buckling spring to a Topre Realforce is not really fair. They both are entirely different. But, even while first trying the variable I could tell that I liked them more than the cherry reds (which I would compare them to). The reds are springy, and the 45g Topre switches are smooth-boobs (which is what I would call them). The 45g and under switches lack the spring to me, while the 55g swiches for Topre have the perfect amount of spring.
Most people prefer lighter keys (at least it seems that way to me) around 45g. I found out that I like something a little more stiff/springy. Which is why I see 45g Topre and under switches to be rather boring (just don't feel quite right) to me compared to the 55g. I still would take an all 45g Topre board over any other switch. The weight below 45g for the Topre just get worse progressively. I don't know how anyone uses those all 30g boards.
So yeah, I would still take a 45g Topre Realforce over any other mech board (excluding the all 55g). But, it is a much closer call compared to a 55g Topre board (cherry reds, and Topre 45g switches are about equal to me, with a slight edge to the 45g Topre). The big reason why I like the Topre switches is the weight being at the top of the switch (as opposed to the bottom), and they just feel better to type on/game on for that reason. The downside of the Topre switches is the lack of custom key cap choices, and the cost of them. I can live without back lighting, but it's nice to have different color key cap choices. That to me is the only downside to Topre switches at the moment. If there were more customization options available (at a reasonable price) then other cherry switches would have even less on Topre switches. As it is now, Topre is still the best despite the higher price tag.
To the OP, I can understand why you don't like Topre switches. They are very linear compared to what you are used to. The force required is much less for these 55g keys compared to your buckling springs. Everyone just has their own preference, and people who like heavier switches seem to be in the minority (as you might be in the minority for not liking Topre switches the best). Good luck!