What i like about the proseries II kits is they are a great base for any rocketeer... the psII kits provide a great platform for modding the rocket with ejection baffles zipper-less designs etc... i highly suggest (as with any Estes kit) getting some kevlar and mounting to either the motor tube or baffle instead of the tri-fold method... the argent has a payload bay already i. The design which is a huge selling point for me... also i loved the Cherokee D style fins... the overall size of this rocket is very impressive as well... i was rather surprised when i completed assembly and how tall it stood... the only downside to this rocket for me is that the body tubes are not your standard size so baffles and bulkheads need to be custom cut... other then that all parts are extreme well quality and fun rocket to fly...