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I loved and hated my Quinny Speedi.
I bought it for my second child having had a Gracco three wheeler travel system for my first child which I loved and wore out.
What sold the Quinny Speedi for me, was it's compatability with the dreami carrycot and the maxi cosi carseat. I used the frame successfully with the car seat and dreami carrycot and found the clicking in and out mechanism relatively easy to use. My main complaint with the clicking in and out was that you needed two hands to do this (one either side of either the car seat or the carry cot) and as baby got heavier I found this somewhat awkward.
Also, when using the frame for use with the car seat and carry cot, I found I did not use the actual pushchair bit, which I would have wanted to once baby was growing out of the cot, but because it was so cumbersome to attach to the frame, I tended not to bother.
The Quinny Speedi was a dream to push around and the large wheels meant that it was great off road and up and down kurbs etc. My biggest complaint, however, was the width of the rear wheel base and this is what made me hate the pushchair. The Speedi and indeed the buzz are very wide at the rear of the pushchair which is a nightmare if you intend to push it around town at all. For off road or Supermarkets - fine.
If I could buy again, I would not, next time I would go for the Britax 3+.