I have recently purchased a double nipper 360 pushchair and could not be happier with it.
My buggy has the new 360 swivel wheel which is great but to be honest this buggy is soooo light the fixed wheel one probably wouldnt be much harder to push.
My 2 little girls are 22 months and 2 years 11 months old, in there lifetime i have had a fair few double buggies but nothing can compair to this.
It is so easy to push even one handed with 2 toddlers in and very easy to get up and down kerbs (the trouble i have had with most other doubles) it also feels very sturdy for a three wheeler.
The seats are very roomy and my two sleep comfortably for hours, they also lye completly flat which is great for newborns.
I have purchased the extra basket and feel that with this and the 2 net pouches you can carry a lot of stuff. The hood is also great as it is long it covers the children really well in the sun and has 2 zip compartments on each side which is great for storing bottles, dummies etc.
All in all i couldnt praise this buggy enough i just wish i found out about it when my 2 were younger.