The strenth of your replacement doors is critical. Many people are unaware that there is significant differences between upvc panels, outerframes and locking mechanisms. In recent years it has come to light that many installers when replacing a front doors often do not reinforce the panels, and usually do not use anti bump locking cylinders.
It is true to say that you only get whta you pay for, in the case of a upvc front door, this is certainly the case.
A well installed reinforced door will last for a longer period of time and gives piece of mind that it is assisting in detering your home from attack.