I just opened my BOX Silent Browns.
The first thing that strikes me is that these are very light. They can't weigh much more than regular BOX Browns, and may even weigh less. Anyway, they're definitely Brown-weighted. I tested them beside some 63.5 gr Ergo Clears, and the BOX feel as light, or lighter.
The second thing is that they aren't very tactile. They may be slightly less tactile than regular BOX Browns, but I'll have to test them side-by-side. They have a similar profile as BOX Brown. There is a tactile resistance right at the top that has to be overcome, and then it just drops. I recall BOX Brown as having a steeper and starker 'drop' that felt more like a buckling mechanism.
It's a profile that resembles Zilents, but less steep, less tactile. Someone recently said that they feel midway in between Zilents and Aliaz, maybe closer to Aliaz, and I agree with that in terms of overall tactility. But the bump profile is closer to Zilents than Aliaz.
They're basically a less tactile, less sharp Zilent. That may be good or bad for you.
Third, they're definitely silent. They are much quieter than the Ergo Clears they are running beside. They might be quieter than Aliaz, since there is no weird spring noise.
Overall, these appear to be perfectly functional silent switches. They are a not-too tactile version of BOX Browns or even Zilents. They feel consistent and fairly smooth, but also kind of boring. Like these haven't been designed to wow you or anything, just function as a silent Brown using the BOX design.
I took a risk and have a couple of GMK keycaps on them right now, and it sounds and feels fine. Nothing has cracked yet. I think I may enjoy the KBDFans Dolch more with these switches. Very quiet and stable.