This is one for those who missed the moulds the first time around, as it doesn't offer anything too interesting for those who do already have them. Ratchet and Brawl are the most obvious varients, with only minor changes to Ironhide and Bonecrusher - so it feels like duplication to get the 2 significantly different ones.

The theme behind this set is a bit of a mystery too. These four characters never appeared together in either movie... and the name of the set suggests it is from the final battle of TF2. I remember seeing a Bonecrusher clone... so maybe there was a Brawl clone as well.