I purchased Tracks on a whim and after playing around with him, I think I like him more than Sideswipe though still below Wheeljack and Prowl.

Granted Tracks does have a fiddly transformation, it's not much worse than Sideswipe (whose head thing always scrags my goat). Both have my favourite alt-modes of all car bots however Tracks wins out because of the poses he can do with the flight stand. I love being able to do all the flying type poses with him.

The backpack doesn't bother me that much, I actually think it's pretty well done given Tracks character design.