I've got the opposite problem, the 450xc is my wife's bike and I want one myself since she won't let me ride it unless i've worked on it. The thing is scary fast as it sits right now.i love it, wish i had more dough to buy goodies for it. my wife even likes driving it. if i had even more dough i would buy another one for her. and if i had that much, well....
what do you need to do on the 525I can't comment on the 450 as I have the 525XC.
Apart from the engine size they are an identical bike.
A few small issues that are easily fixed.
Have a read through the forum and you will find all you want to know.
Would I swap mine? Not a chance.