Check the screws when you take delivery and regularly thereafter. THEY WILL LOOSEN!. I was asking for it because I clamped mine down and used it as a guide for power tools and I suppose the vibration loosened them.
It's fussy to get them back in place and locked down. There's only a small amount of play in the holes but it is enough set it off quit a bit way out at that 26" extremity.
Relying on friction is not good. Ideally it would be one monolithic object machined from a single piece of aluminum. I suppose that would have pushed the cost out of sight or perhaps that isn't feasible. Barring that there should be positive machined locking, a key way or slot or something, for the side pieces. Or even the stainless steel pins that the 12" has.