Recent project has found a very small problem with the Mini Buffered Prototyping board.
The cut for the edge card connector is too big by this much (holding pinched fingers up to show 0.010")
See photo below, the board wouldn't fit and the whitish surface in the circled part shows how far in it went and where it was binding.
FIX: With a small file, give each side of the S100 connector a few strokes, don't need much, it's very close. 5mil on each side, is enough.
I did mine with a taper, works great.