The 501st Legion served under Jedi General Anakin Skywalker and Captain Rex. This set is the perfect example of a battle pack. Including several clone troopers and two battle droids for opposition.
Three of the troopers are 501st clone soldiers with blue decorations marking their phase II clone armour.

One trooper is a 501st Jetpack trooper he has red markings on his helmet and torso with blue arms and a blue jet pack.

Two battle droids are included.

The build is pretty simple and straightforward. First you build a clone BARC speeder. Then you build a Clone Walker or AT-RT. They both are a bit large compared to the Minifigures but look amazing as far as details go. The speeder has stud shooters and the walker can move its legs and has a single stud shooter.

Overall this is a great set. The only complaint I have is that the AT-RT's legs and feet have a limited range of motion. I also would have liked them to have included Captain Rex in phase II armour, but I guess that would have defeated the purpose of a battle pack. Other than that this is a great set with loads of playability and details. I am sad to see it go after a good long two year production run. I can only hope for as great of success with 75345 501st Clone Trooper Battle Pack.