Yep, the construction of this ski sucks, almost as bad as Atomic's warranty system. They are a fun ski though, unless you case a jump the first day you ride them in which case this happens;
And if you get them warrantied the first time and try to warranty them again 2 months later because they break again dont even bother.
Granted I was a little heavy for them but the general construction of the ski was horrible.
And as far as I know, there isn't much of a difference between Punx and Urban Punx.