To be honest, a lot of folks preferred this over the lock boxes when they ran the last promotion with the gamma quadrant doff packages. With the lock boxes, you stood a very good change of receiving nothing of value. At least with these, you're going to get a selection of doffs that you can use.
I'll take the DOFF pack + bonus something over lockboxes ANY day.
I purchased DOFF packs. I received DOFF's. The bonus extras were exactly that - bonus extra's - a nice extra perk on top of the purchase of something I wanted/needed anyway. I may not have gotten the Tuffli, but I did obtain a Powered Alien Artifact in one pack I opened, which (subsequent to a DOFF assignment) yielded a very nice MkXII console.