i have the mutsy urban rider chassis and single seat unit. i am now expecting my 2nd baby and will need a 2 seater. i'd always intended to buy the 2 seat unit for this chassis, but just wondered if anyone has any experience of whether it's good or bad. the new baby arrives in october, by which time my daughter will be 15 months, so too young to use a buggy board with the one seater. anyone any thoughts please???