I got an RF103UB and an RF103white (specially made for Taiwan User, PS/2 version. I guss they only made that for like..13-15 pieces) I also have filco with Brown swiches and black swithes.
It's fairly odd to me, cause we rarely discuss the different between Topre and filco in Taiwan or China. After all they use totally different skill to make keyboards. Hence the typing feel for Realforce is extremely different from Filco.
I always tell my friends if they want to buy a Topre keyboard, it's truly necessary for them to try it before. But since it's almost impossible in USA. I guess we could only describe how it feels on the web.
(Maybe that's because Taiwan is not a big island..LOL if you drive from the northest part to the southest part, it might takes you only 6-8 hours depending on the traffic)
Actually I find most of the keyboards which uses cherry switches are feel alike, for example like KBT, GP101, DAS 3, FILCO. There might be tiny differences but we tend to ignore it. (LOL) Therefore we seldom discuss the difference between them. Instead we discuss more about their function.