IMHO this is an excellent article by Mike MaCarthy and well worth the time it takes to read. The Title says it all. . .there ain't no such thing as the perfect payware product and understanding that will go a long way to saving your sanity and lowering your blood pressure.
http://www.flightsim.com/main/op-ed/ed421.htm
http://www.flightsim.com/main/op-ed/ed421.htm