As Tremeer023 I have a Moxie, where i started out riding it at 425mm. Eventually i went longer and longer and am now maxed out at 441mm. Seems like most Moxie owners are going that way, and especially those that ride tech trails. The stability is a lot better on rough trails and flat corners are easier to rail.
If i was riding smoother trails with bermed turns long chainstays probably wouldn't matter much, but for steep tech riding it is so much better! Manualling, take-offs off lips and going over square hits is something you get used to quickly and adapt the balance and timing.