The backpack is honestly worth it I think. Made it a lot easier (and safer) to tote around my little friend.
I took him on Space no issue. The box is a huge pain (although note that battery instructions are on the bottom of the box; I made sure to still get the box and then put my droid in the backpack after I stepped away from the Depot). Plus for return visits it makes life much easier having the backpack
I'm not that thrilled with my personality chip, but I do not regret getting the backpack or the blasters.