Not all sellers are the same with regards to customer service.
I'm a nanny and have used little nippers - out 'n' about in three jobs (have looked after three sets of twins, separately), any time something went wrong, brake broke off, axle was bent by aircraft lauggage handles, rain covers split (in different places!) on all three, hand brake on handle broke, tyres (3) buckled (again by baggage handlers) everytime I phoned them up, they could not be more helpful and all of the above replacements were sent out, free of charge! The first raincover was replaced after 2.5 yeats!
Maxi-cosi are the same, they changed a car seat that we ordered direct as the packing was dented. They sent 2 new covers as 1 of the car seats started to fray and they had stopped doing that colour, so replaced them both so they matched (perfect for when we were potty training as we had a spare!) staff were always friendly, pleasant and extremely helpful!
Avent again, replaced bits of bottles, sterilizers etc, free of charge, pleasant and helpful.
As a nanny I always recommend these three companies to anyone and everyone who will listen!!