Recycle your old 4-wheeled suitcase and upgrade to this. This is so much better for traveling around. The two large wheels are great for those who don't just wheel around in the airport. Tons of space and loads of handles to easily grab the bag while you're trying to navigate stairs, rail travel, etc. The only change I would make is the inside compression straps. One side of the strap needs to be about 8" longer, as it gets easily buried when packing.
I have two Thule bags from years ago and have loved them, we travel with our whole family and love the robust style. However this version seems different. The surface scratches immediately, after the first trip it had water stains and looks ten years old . Very disappointing from Thule. I will think again before paying so much for this suitcase -