Which RF do you have? The variable?
The lighter weight Topre have very little tactile feel to them....So like the "A" key for example, at 30g or whatever it is...it feels basically linear...I actually don't mind the variable weight for typing..it makes sense..and it is actually very relaxing to type on..but I do wish they were slightly heavier...
I've got HHBK which I have been using for last 2 years and almost unused Realforce 45G uniform. Only noticed change in HHKB feel (in the most used keys only, like FN, CMD, CONTROL, ESC, SHIFTs and ; ) after getting the realforce which is is pretty much uniform through out the board.
But that I could live with, unfortunately shiny space bar is really annoying, especially with the prices of whole Topre key sets for which you can get whole Unicomp with all PBT keys, including space bar.