Well it does make sense to me !
Having been an R&D engineer in high end video-analytics for years, I believe it should be feasible.
Every technology seperately they're describing on their website, already exists, is in development or feasible.
What they're merely doing is combining all this technologies in a nice futuristic designed "egg", which looks mechanically pretty stable as well, and modifications to let it walk over rough underground should be not too hard neither.
I admit, it is an ambitious project and they're making a lot of claims. But not impossible.
Given the composition of their team, I also think they have a strong multi-disciplinar skilled team to bring this to reality.
I also think this is not a replacement guard for standard outdoor security, but has more future inside industrial environments, where the atmosphere is hostile for humans due to chemicals or radio-activity, where this little robot can combine security with safety and advanced sensors for process-measurements.
Regarding technology, it's all feasible. The only question on my mind : their businessplan. Will they get enough funding to develop their product from concept untill finished product, and will they be able to sell it.
But for me, it looks like a perfect product design. If it could also do the dishes, swipe the floor, and make diner, and I would have enough money to buy one, I would buy it ;-)
I do believe this is the future. Not for within a year, but given 5-10 years, devices like these will be common in industrial plants, and in the household.
Furthermore, I hear a lot of calls on this platform for more innovation in security industry and a long-term vision, but when a smart, futuristic idea comes along, it gets ridiculised because at this time, we can not imagine it, or compare it with past mis-designs.
Please, instead take a closer look at it, value it's benefits and (try to) see what's possible with it, not directly tomorrow, but on the long run. The concept looks good, the team looks like an A-team, and I can already think of a number of applications, other then just plain perimeter protection.