NWOB Aerodynamics is the reason if the inevitable consideration we all have had when first contemplating owning one……. With the 4 wheel strollers ; wither with or without supplied wheels …… and/or even with outfitted with tennis balls on the end caps. Only having three wheels in motion greatly makes turning and maneuvering a breeze. The three wheels in this particular example are made of a high durability wide circumference slick black hardened rubber. Both rear wheels are wired independently with braking system (similar to how the front and rear brakes on a old pedal bicycle in configuration. The handy well placed shielded with weather protectorant to provide a barrier between the contents and the elements, should you take it outdoors with you. One simple spring Assisted Lever provides for disassembly and very easy to transport frame, which fold flat. So there you have my reasons from My perspective this unit was appealing to me when deciding on which I would have wanted if I was in need of it everyday and do a pro con sheet. Mind you I kept in perspective if I was in their shoes (my father in particular) ….. So I hope this piece makes a positive impact in whoever should so choose to select this item for purchase. Even if you don’t end up buying this from me , If ky item description was helpful , you learned sonething, or you enjoyed reading it. Please leave me a message and let me know .I sincerely appreciated feedback (good and bad )