My daughter is using this backpack for school daily. There is plenty of space inside for all of her books, notebooks, folders, etc. The few extra pockets have been handy for storing her writing utensils and other items. The wheels make quite a bit of difference to reduce the stress on her back from the traditional shoulder straps. The backpack stays steady enough as she wheels it around but if you throw a lot of items to one side, it can topple. Pulling up the handle and pushing it down is super easy.
If you're looking into this for travel rather than school, I think it would be an OK choice as a carryon for electronics and small items, but your not going to fit more than a weekend's worth of clothes in it.