SA-X is kinda hard on Fusion. She just down right scares me. The scary music comes on, and then SA-X comes and chases, shoots, kills. I beat the game though. The last boss was not very hard, died on him once. Fighting SA-X was not very pleasent, but when she turned into the monster thingy it was simple, of course the X virus then fought me with the shooting plasma beam and I died on the Friggin' X. It pissed me off.
Great Game though.