I'll leave my slightly dissenting opinion on Topres.
Here's been my rapid progression. Das browns -> Realforce Topre -> Filco browns
So, all that's said is true. Realforce kb is a solid keyboard. Very solid, feels great. High quality build, love the matte feel/finish to it. The keys feel solid. Now, it's a bit of a sidestep from the other mechanical keys. Less satisfying in some ways. But smooth and solid keystrokes as described. In comparison, the Das keyboard felt cheap and jiggly and too shiny.
So, backing up a little. I've had some problems with my right index finger with repetitive use. In particular due to repetitive clicking using a mouse. I switched over to a vertical 3M mouse a while back and it pretty much resolved the issue.
The Realforce keyboard feels heavier to me than the Das, despite having comparable force profiles. I've seen others relay this same sentiment. It was fatiguing for me to type on the Realforce as compared to the Das. After a couple of weeks my right index finger was acting up again. So I started looking around again. I thought maybe I needed an even lighter switch. Such as reds. I even considered buying the Topre all-30g. In the end I decided this -- in my case, I think the problem was the fact that it's hard not to bottom out on the topres. So whatever force that was from the impact, was causing my problems. So I think red's would have had the same problem. As would the 30g topres. With the browns I can favor my finger and not bottom out. If not for this issue, I probably would have settled on the Realforce.
So I went back to the Das temporarily, and then (just) got a Filco tenkeyless with brown. Both for the better build quality and also the tenkeyless (das is full sized) which I prefer. I'm still curious about the blues, however, but happy with the filco for the moment.
arn