My ancient carry on soft side bag broke on my last trip, so I've spent countless hours reviewing and searching for the best replacement. The biggest complaint about luggage is the zippers break, and that's especially bad for hard shells. I also didn't like the design of the hardshells that zip in the middle with no access pocket on the outside like most soft sides have. That means that you have to expose all your stuff with 2 heavy sides to manage to open it. And if you have the expansion zipper system, that's even more problematic because it puts extra stress on the zippers. No wonder they break.Pros: THIS case has solved that zipper problem and it offers a lot of great features too. The cup holder is fantastic, very sturdy, stable, and it frees up my hands when need be. The wheels roll like butter in every direction. The extension telescoping handle is very sturdy too, no problems extending or retracting it. Don't use it to pick up your bag and you'll be fine. The bag has 2 handles top and side to make picking it up easy. The TSA locking system works beautifully and is well designed. The pop out bag holders and phone/ipad holder up by the handle is great, although I have no idea how much weight they can hold. That information would have been helpful in the instructions but alas, there weren't any. I love the deep box design so that it opens like a "lid" so all your stuff doesn't get exposed or fall out, and that "lid" is very light weight, with lightly padded pockets inside for organizing. Perfect to hold things you need easy access to. The shell itself is very sturdy, probably as close to unbreakable as can be. I read that magic erasers remove scuff marks easily, but I haven't needed to test that yet. As far as how much I can pack in it, it is a bit small but with compression cubes and a deep box design, I don't expect to have any trouble once I figure out how much fits and how to organize it. In fact I like this luggage so much I'm considering getting the 24" size for extended trips.Cons: The phone charger system has easy access with a cover to protect it so that's good. BUT no instructions were included in how to use it which is frustrating. The battery pack isn't included, so I bought a separate pack. The anker battery pack I chose didn't come with a charger so I had to go back and order one of those before I can even test it! wth? sigh. Because of that I haven't had a chance to use or test the phone charger thingy. I guess it works, if I can figure out how to connect everything. The luggage didn't come with instructions in how to use it. There are wires inside with 2 different plugs, but it's not clear to me how it all connects.Wishes: MIXI - please include instructions on how to use the battery pack and tell us how much weight the bag/phone holder on the handle can hold safely. That's ridiculous to not include that. It would be great if you bundled the luggage with the items we'll need too to make it easy. This kind of frustration is not the experience you want your customers to have, am I right?Also, I'm now searching for a duffle underseat stackable bag to fit on top of this one. It would have been great if MIXI offered them as a bundle or at least as an option designed to fit this luggage. So far I've tried 5 different underseat options from different brands, and am not delighted with any of them.Bottom line is, I LOVE THIS LUGGAGE! I've had a great time showing it off to friends, and everyone wants one too. :-) I have not had the opportunity to test it in the real world on a trip yet, but I anticipate no problems when I do.