If you haven't made up your mind yet, here is my take. The PSBs are very good value for the money. They are certainly the equivilent to the M40s. That said, they will not capture the midrange with the same clarity as the M22s. If you are going with a sub, then the M22s are the better bet for the long term. If you are looking for 2 full range speakers, then pick up the PSBs.