We love our Mountain Buggies. A lot. So much that we bought a Duet when we, um, outgrew our Swift. We live in the city, and the only way our kids get around is either walking or in a stroller, which means our strollers take a real pounding. We went through a number of the standard wheels, and they just couldn't make it through the brutal winters here. Dragging the Duet with a flat tire and two squirming kids back from a park on the other side of town was not something I wanted to repeat. The aerotech wheels have been great- I think it handles just as well as the air-filled tires, and they stood up to this last winter extremely well. I can't recommend these wheels highly enough. I honestly wish you could just buy the stroller with these as standard.