I can't help comparing GoT Pro to IM. GoT will be almost as fast as IM, but the drop targets and sword lock will slow the ball down a bit in comparison. The Dragon kicker is just like War Machine, and the "Gold" targets are just like the Drone targets. The sword ramp looks like a screamer.
Comparing them in BOM terms:
GoT adds a drop target bank, a physical ball lock, battering ram toy and an action button on the apron.
IM adds 2 magnets, 2 more spinners, and the Iron Monger bash toy.
Trading the 2 magnets for drops and a lock would be tough. But if the rules and audio were amazing on GoT, I might be tempted to sell IM.