The feds mandated that the ROPS (Roll Over Protective Structure) has to pass certain tests with the new UTV's. They will with stand basic roll overs with out crushing, but If your doing more than basic normal everyday joy riding (i.e jumping, racing, hard duning or serious rock crawling) you may want to consider investing in a new cage. Knowing me and how I ride, I would remove the stock one, and for added safety add at least four point harnesses.
Just my .02.