We picked up our City Select in Onyx today!!! Stoked with it.... we have wanted it for ages... So much room for both kids esp as they get bigger and longer legs on them.... lots of basket space underneath and I find it easy to fold down and up. Yeah it's heavy but all double prams are! We'll have a newborn and DD who will be 2yrs 3mths and only 12kgs.
Lady at the store said you can put newborns in it too and it's safe just recommended using head padding inserts and like lambskins etc to support them a bit and reclining their seat back more than the toddler seat would be reclined. ITMS.

I don't think it's very long, compared to some of those double prams where the seats are fixed and can't be moved, some of those prams are SUPER long!! LOL