I like my Joovy - quite a bit - it has one of the biggest weight limitations and that's why we got it. My daughter is now five,my son is 12months and we walk as often as we can. She stands up most often and sometimes will sit - and the seat has a seat belt so she can stay in securely - though we don't use it.
It is long when it collapses so if we didn't have a little station wagon and only our compact it wouldn't fit in the car.
My one concern with it is the level of comfort once you are no longer using your car seat. It could conform more to the child to help with sleeping stroller walks.
Oh - AND - needs more cargo space too - so I invested in a mommy hook for the bars. I will carry 3 or four bags of groceries home sometimes - so - more cargo space or at least better cargo space would have been nice
The other thing that I really liked about the Joovy was the color choice. We walk some busy streets and having the bright red makes us super noticeable. Good luck.