I would get a few for myself, but I already have 6 PB SF units, and I think any more would be overkill (I use 4 at a time in the winter swapped between 3 bikes).
Based on some reviews I found on the Smart unit, the flashing pattern is NOT like PB SF. (A bright burst from the big LED followed by a few blinks from the smaller LED's below the Blaze unit). The Smart unit sounds like it moved to a standard blinky pattern to meet UK guidelines (straigt on-off-on pattern with regular intervals).
However, for $6.16 shipped each, I don't think you are going to find a better deal.
Deal will last until next Tuesday or until they run out.