A link to an article about the pickup towers with a few pics.
We were one of the two test stores for these and had one for over a year (I'm in Wake Forest, NC area). Several of my gifts last year had to be picked up at the tower and it was a fiasco. I spent over an hour in the store, being sent from the tower to the layaway area back to the tower, etc. There was a rep from the tower maker there and some higher ups from Walmart and the whole situation was super embarrassing to them (not enough to throw me a gift card or something tho lol). I haven't used it since, but it sounds like they have worked out the kinks and it was successful enough to expand their usage.