So, I have spent time comparing my Das Professional S (with Blues), my Leopold Tenkeyless with Blues, and my Filco Tenkeyless with Browns.
I want to keep this short because I have more papers to finish and other things to do, so...
The Filco is a really nice board but I cannot say that I like it more than the Leopold. As I have mentioned earlier, I have had no trouble with the stabilizers on my Leopold (only slightly stiffer than on the Das and Filco and they have actually loosened up to feel the same now). I also cannot say that I like the Filco less than the Leopold. In my opinion, I think both keyboards are equal, the Filco's quality a tiny bit higher but also lacking the useful removable USB cable on the Leopold.
Note that I am fairly new to this whole mechanical keyboard scene, only about a month's experience with my first (the Das) so I may not be noticing nuances that others might.
Verdict: I love them all.