I have been using maxpresour to sort incoming materials since 1997 when it was called DATAMailer Pro! It has always worked flawlessly - no complaints there at all in that time period but this version changed drastically from previous versions so if you are not familiar use or experienced user than stick w/ an older model as they all did basically same thing back then and will continue today in my opinion. This new release had major changes which made sorting extremely difficult compared to other programs we were previously running before.