Well I have the FX 450 Berg and it's a "do it all" type bike that is supposed to go from the MX track to the woods, kind of like the KTM XC line was too........... not the enduro model with lights at all. But opinions are like butts........... everyone has one. And the bike is a little heavier..........1.2 lbs more than an RMZ450.......... that makes gobs of difference for taking it on a MX track. And while you're going HMMM, you can try to keep up with my heavy, slow, enduro bike at Red Bud at Vet Fest in a variety of classes if you so choose to see why anyone would want to ride it on a MX track............ I like the bike and the way it handles and it's allowed me to go a little faster than I used to and beat some guys that I've never beaten before this year.
There are people out there that like RM's, KX's, CR's, YZ's. SX's, and even Husabergs....... to each their own is how it should be.