Well.. as one of the bigger fans of the New Xeniums.. and frankly.. of all of the new Gen4 chips.. I'd say that if your Chameleon is serving you well.. and everything is running as it should.. you really have NO reason to update.. period.
Now.. if your Chip unexpectedly takes a shit or something.. then by all means consider a new Gen4 chip like X3, Xenium.. etc.
I don't think anyone can go wrong with the new crop of chips from the big boys these days.
I always advise people to Upgrade on NEEDS.. not on what is necessarily cool or "in" at the moment.
If you don't need it.. don't. Now.. if you've had issues flashing for some reason.. and have been screwed by a bad flash or something in the past.. then you might definitely want to jump on this.. or wait for Xecuter's offering.
Hmm.. I started this post trying to help..

dunno if I did.