Happy Meal Hot Shot had that cool pull-back friction motor. Cyclonus was one of the weaker of that set though with the fairly average coptor-blade spinning gimmick and awkwardly visible head in alt mode (for a Happy Meal toy this is mediocre - for a Voyager like Energon Ironhide, it's downright disgraceful).
The Armada Happy Meal Autobots could all combine into a gestalt robot while the Decepticons combined into a gestalt vehicle. They both looked kinda odd (the Autobot gestalt bore a vague resemblance to that 'cyclone attack' from Gatchaman), but again - pretty kewl for Happy Meal toys. One cool feature with all the Armada happy meal toys was that they had Mini-Con ports which you can actually attach Mini-Cons to!
Hot Shot and Starscream are my favourites of the Armada meal toys, especially Starscream because of his Jumpstarter gimmick (which actually works better than the G1 Jumpstarters!).