We've used the Zippy so far as our main pushchair from birth to eighteen months and it's still going strong. We liked the idea of being able to use it as a travel system and the folding mechanism looked impressive. In use it hasn't disappointed.
The mechanism is a doddle to use, you really can operate it with no problem with just one hand - which is incredibly useful when you're out and about just with baby - but the mechanism is also very secure, so we've never worried that it might accidentally collapse.
For transport and storage purposes the umbrella folding system leaves you with a very neat package which is really important if your car boot is less than generous - as is ours.
The multiple position options mean than you can use the pushchair right from birth and, unlike some pushchairs, you don't feel that you're compomising quality for this flexibility because the chair seems to work just as well in all the positions and it's easy to switch between them. We've used the Zippy frame in tandem with the compatible car seat from Inglesina and the two work very well together as a travel system, with the Huggy simply clicking on to the frame so there's no need to faff with moving baby from chair to chair.
You might be concerned that with all that flexibility the Zippy might be fiddly and flimsy, but Inglesina seem to have done a great job at combining the chair options with ease of use and a solid feel. The Zippy is very sturdy but without the heaviness of the super-robust three-wheelers you can buy. The only real sign of any wear and tear after eighteen months is that the brakes on one side now work a little better than the other.