My Design Series kit included a box of memory locks and an assortment of spare tension rods. DW is the only company I've seen that includes spares. Some of the boutique manufacturers might but it doesn't appear to be a common practice. Advantage DW.
I guess it’s a cool gesture. Though I do wish that they’d just include Remo USA heads. I think if it’s going to the DW name, then you’d expect they sound great out of the box and while it was ok, I had to immediately change the heads to get these drums to sing properly.