I never rented a stroller on site. The price is to high for me to justify. We have always brought our own. The full deluxe stroller when they were toddlers and now we go with a higher end umbrella stroller for DD, who is 4. We have the Evenflo X Sport Plus Convenience Stroller. It has more room and feature than a traditional umbrella stroller and very easy and light to get on and off the buses and only cost about $50.
I too considered a Sit and Stand when I bought the umbrella stroller. At the time, the girls were 6 & 2, and I worried that the oldest would have trouble keeping up, but she did fine without a stroller. When looking, we thought the Sit and Stand was pretty heavy and will be awkward getting on and off the buses. Both DH and I were happy with the stroller we picked and we are taking again on this fall’s trip. We kept the box it came in and we just check it at the airport in that box. That way it doesn’t get damaged in transit.