One of the companies where I previously worked had Command installed and it was a great system. I would thoroughly recommend it, if ever I need to buy buy flight planning software, Command will be it. Once you have a number of your regular plans stored, flight planning can be done in under 2 minutes including SPFIB. It can also handle wieght and balance calculations.
Cheers, HH.
PS: All low capacity RPT with some IFR charter.