Quick update: After having the Baseline now for several months, and going on several short and longer trips with it... its simply the best bag I've ever had and its not even close. I used to be a Tumi guy a long time ago, and most recently, we've had all TravelPro MaxLite 4's and 5's. Not to say that the ZDX wouldnt have been great, but my kids are able to actually help push the Baseline luggage through the airport when these things are full of ski clothes and what not, and the balance on them is unreal (vs our TravelPro's which can tip over relatively easily). I'm in the process of retiring a 2nd TravelPro MaxLite4 bag and will be getting all Baselines moving forward as each of these guys meets end of life.