SpaceX and Falcon 9 have made huge changes to the launch market, they've become the best vendor for many commercial payloads through a combination of price and performance. However, it's important to understand the limits of the hardware so I wanted to discuss where the Falcon 9 comes up short compared to their competition at the ULA.
(not hating on SpaceX or ULA, just trying to put the numbers out there and stop people saying dumb things)