1 is a fantastic buy, the second one depends on what you are wanting to do. Truth be told most lists wont use 2 units of Rocketmen, or 2 units of Assault troopers, and of course Syvestro and Gorman are a waste as you can only have 1 of each.
You sure can make lists that double down on Rocketmen and Assault troopers and I would argue they are not even bad choices especially with Syvestro. So its very viable to make a competitive list using both boxes.
Nice thing is Discount Games Inc has them on sale for $115 each.
At that price even if you get it just for 2 jacks, a Trancer, a Dragon Rocket, and a unit of Combat Alchs you are doing well. So having the extra Rocketmen and Assault troopers for $10 more is IMO worth it!