Overall they are pretty good though quite expensive on MBS; could get the Yonex clamps elsewhere for 33% less compared to these. I mention this because I prefer the Yonex ones over these.
The MBS ones are a little narrow for the crosses, which seems to put more stress on the strings.
Sometimes I use these clamps to add a little leverage to tying off strings and sometimes these slip and again the Yonex ones don't. Unfortunately I've relegated the MBS clamps to clamp outside the frame to act as a starting clamp (two of them).