I've had 4 echeque payments fail in the last month. Zero in the last 2 years before that.

Only one buyer responded and made payment. Although they did give me attitude about it like it was my fault or something.
The rest just go to UPID and I never hear from the buyers at all. There does seem to be an increase in echeques failing though.

Given enough strikes the buyers lose out in the end on sellers with their blocks in place.