Space is always an issue with such huge items, but I find myself more and more drawn to these large "centrepiece" items.
Regarding the future, I would love to see Super7 go with the smaller 1 person vehicles before considering another big item. I means the mutants need a Sky-Cutter and Nosediver to go against the Thundertank.
Also I think they could probably sell a lot more units for something smaller. Of course it would depend on price.