One of the best bags we have bought. The 4 wheels do make a difference. The quality of Travel Pro with zippers, materials used and design is noticeable.  I travel about 75,000 miles per year. My bags get used a lot.  These hold up well and are easy to push around.  I don't need the suiter feature and wish you could zip away and remove.  Two outside pockets are great for additional storage. Handle works well. Really nice bag.