<span style="font-family: Verdana, Arial; font-size: 13px; background-color: rgb(251, 252, 255); ">flying the 450 a lot will make one LESS likely to crash the 600</span><br style="font-family: Verdana, Arial; font-size: 13px; " /><span style="font-family: Verdana, Arial; font-size: 13px; background-color: rgb(251, 252, 255); ">and</span><span style="font-family: Verdana, Arial; font-size: 13px; background-color: rgb(251, 252, 255); ">the 450 is a lot cheaper to fix than the 600</span>
I can definitely vouch for the 450 being cheaper to fix than the 600, $500 later.