I haven't found any problems with it yet, I'm 5'4 and it's ok for me, I think earlier on in this thread height was discussed so have a read back. I really like it though it's really light and easy to push.
i love my zia even though the back wheels have come off on 3 occassions. i make sure that if it has been folded i give each wheel a quick push when opened up again. since doing this the wheel hasnt come off again ! i am 5'5 and i think the height is perfect. if i use my maclaren for any reason it feels really heavy compared to the zia.