We bought a second hand twin stroller and had our first outing with the stroller at Botanic Gardens. The stroller easily weigh 20 kg, and it is quite cumbersome to carry it. But on wheels, they are great. The seat is too large for Heidi and she kept falling to her side.
Oliver seems to like the stroller in the beginning but he still prefers to be on his feet. He walked quite a fair bit and fell asleep on his way back home at around 8pm. Right through the night he slept and until the clock struck 8 the next morning that he cried and woke up.