Demo, demo, demo. Good luck with finding a deck that does it all and when you do let me know where I can get one. I live far north and have the finest fescue around. Battling stragglers/stingers and pressed down grasses up here on a 460 with the X Factor. IMO due to low vacuum or lift. Not as bad with mulch kit but the mulch kit has it's own problems or limitations. Discharge is great. I hear more positive though than negative from guys south of me.
Been a while since I've run Scag (about 12 yrs. ago in Ohio grasses). They remind me of the Hustler Super Z set up for handling grasses at high volume at high speed but leaving big carpet of larger clippings in lush grass. Things probably have changed since then though.