I did a lot of research before purchasing new luggage for an upcoming trip and finally settled on this bag. I loved the idea of the detachable backpack and that the suitcase itself actually met carry-on regulations. When the bag arrived, I was impressed with the material it was made with, as well as the design and was really looking forward to using it. The suitcase itself is on the smaller side, which is expected given the dimensions, and like many of the wheeled suitcases, the bars of the handles do take up room inside the suitcase leaving the bottom uneven instead of flat. However, the suitcase itself is very light. I was able to fit what I had hoped in the bag itself, but the backpack was a little trickier. It seems to be built nicely with padded sides that leave it structured even when empty, but the design makes it difficult to fit things in as well as I would have liked. I did have a bit of a tall order though, and managed to squeeze in my 15" HP laptop, my dSLR and extra lens in the medium Crumpler Haven, my laptop charger, and a paperback and a couple of DVDs into the main compartment. That left it totally packed, and meant I could not keep my laptop in the padded case I had bought for it. It also meant there was very little space left in the other smaller compartment, but I did manage to fit my bag of liquids and a few other small items. The outside (tiny) pocket held me phone, credit cards, ipod and headphones, and keys. With the bags packed this way, there was no chance I was zipping the backpack back on to the suitcase, but I didn't mind that all that much as I fully expected to use the strap on the backpack that let's you slip it over the handlebars and rest it on top of the suitcase when not on the plane and that worked fairly well, although it ends up being pretty heavy when dragging it that way.
Although I was finding the set a bit tight on space, the major disappointment came while on my flight out to my destination. At one point I reached down to get something out of the backpack only to find that the handle on the top of the backpack was partially ripped off. This was the first time I had used it - I had literally carried the gear to my car, loaded it in, unloaded it at the airport and boarded the plane. In that time, I must have used the handle only a few times and yet it was already ripping. By the time I was part way through my trip, it had ripped off completely and the strap it was attached to on the side where it ripped is now coming loose.
Sadly I will be returning this due to the poor stitching quality. Maybe mine was just a fluke, but obviously handles and straps coming off the first time you use the bag is an indication of a product that isn't built to last or stand the wear and tear of travel. It's unfortunate because otherwise I think the design is nice for someone traveling only a few days at a time or who can pack pretty lightly.