Cosatto Mobi 3in1 travel system reliability?

Me and my girlfriend are expecting our second child in January woo hoo! We thought we had done all our groundwork and finally agreed on a Cosatto Mobi for a pram as we live in a top floor flat and it seemed the ideal choice as it seemed very flexible, practical, light weight and chunky rear wheels for all them stairs! it also seemed to have a tight turning circle and was very easy to fold and erect. However as it is very hard to find reviews about i would like to hear from any users as i hear they may not be the most reliable pram