Of the 5 Cincinnati's I have owned, I still own 4 of them, and kinda sorry I sold the last one, but it made sense at the time. The 2100 is in my opinion the most powerful job shop control on the market today. No BS with dnc, just tie it to the network and run your programs right from the server. I have put a total of about 50,000 hours over thlast 4 years between all these machines, nothing out of the ordinary has gone wrong. My personal experience with local support has been outstanding, and I have had no parts availability issues.
While I liked the 500 I had, I like my 750 a whole lot more. I would not go smaller than a 750 again. My largest machine is a 1500 that I recently aquired used. It came out of a blow molding shop, has about 35,000 hours on a 1997 machine. They replaced it with a new Cincinnati 1500. evidently they were happy with it too.