I've been wearing Triumphs for the past 5 or 6 years and run a couple of 13 milers per week on the road in my community with elevation changes.  The pluses for the "5" are: lighter, "cooler", a bit more responsive and a better heel.  The negative: the forefoot does not seem to be as cushioned as previous models (I pronate rapidly and tend to move weight to my forefoot accordingly).