I have had two pairs of tweaks (one was stolen so I bought another set) and I can honestly say they are the BEST ski I have owned.  I do 50/50 park/all mtn.  and they are great.  However, they are not for everyone. They are a pretty stiff ski so if you like softer skis dont get Tweaks.  If you do, they are awsome.  They will blow through any crud and hold a sweet edge on the sickest ice too.  I have skied 1080's, Scratches, PE's and many other twins and the Tweak fits me the best.  If your looking for a park ski only, they are probably too stiff for you but if your looking for all around they are great.  Good luck.
~n~