Ok , we used SQ D, and gave that up, when we had call backs, with defective main breakers, never had a problem with any other then Mains in SO D, other then having to chisel out the KO's, that were stamped, with a tired punch.
We also tried Seimans, they wer ok except about every 10, or 12 loadcenters, you could not reset the main, seimans said they never had any complaints, talked to other EC's and they had athe same problem.
We now use CH, and have not had one problem to date.