We have a One Planet Goondi 3, the plan was the three kids would use it and we would use the Goondi 2.
The bride and I just did seven days on the overland track using the Goondi 3. We were happy with it performance including one night in the snow (all of 25mm of snow).
Our eldest son used the Goondi 2 for himself......the other two kids were DNS's.
I'm only familiar with the Mont above (thinking it the same one we looked at), watched it being set up in the shop
Interestingly we were asked on a number times during the walk about the Goondi, hikers wanting a closer look.