All I've ever owned have been 500 series Z Masters and Lazer Z's with Kohler air cooled engines. I really don't have a whole lot bad to say about those machines. Somebody on this thread mentioned he was an Exmark guy and hated the Toro Turbo Force decks. Honestly, after all these years with Exmark & Toro, I can't say I see a difference in the cut. Never have.
For me, the conversation begins and ends with Exmark, Toro, or Scag. I really have no interest in Dixie Chopper, Kubota, Ferris, JD, or any others. The only other brand mower I would ever consider owning is Scag. I've always admired Scag machines. I just never had a reason to switch from what I've always used. Until this year.
It just seems Exmark's build quality is going down. I don't like plastic pulleys. And I can get Turf Tigers with Briggs 35 engines for considerably less than an Exmark. ...And the velocity deck is very appealing.
I still want to demo a new X series Exmark 60" before I make up my mind. But the price tag, along with a few other things, has me leaning heavily in the direction of Scag.