i have a trip. love it, although they run about 1/2 size big, so i just ordered a small and sold my medium to another member of dml.
the old cabergs were really big, but the newly redesigned trip actually isn't. i can't recall the specific dimensions, but it's about 1/4" wider than my arai rx7, primarily because of the hinge mechanism covers, and maybe 1/2" longer because of the flip-up gizmo and style. it's actually surprisingly light as well, less than an oz more iirc than my arai which i consider a very light helmet.
i really like the chinstrap on the trip too. it has a seatbelt-type release. i've seen the justissimo, and just didn't like the look of the thing. the trip seemed to complement the monster better.
the trip fits a variety of head shapes well. i'm a rounder head (arai quantum, shoei rf/z), and my buddy is a narrower head (arai signet), and it fits either of us great, kinda like the higher end arai rx7 or shoei x11 do.
hope this helps.