Our shop has a Cincinnatti Arrow VMC-750, purchased new in 2000. Here's my 2 cents..
Control: If you're used to a Fanuc style control, this will be a whole new world for you. Windows NT based and very powerful. More options than you know what to do with. If you have the proper manuals, it can be fairly easy to learn. There are some very nice features in the control.
Quality: Ours has been used quite heavily for 6+ years, with no major mechanical problems as of yet. Keep up on the basic maintenance and you should be fine. Our linear way are starting to get a bit sloppy (slight chatter when interpolating.) We heavily use our machine for drilling and plunge milling. We can peck drill 316ss with a 1.875" indexible drill and reach 100% load. Sometimes we drill 6+ hours a day on this machine. It can handle most heavy milling jobs well.
There are a few main drawbacks to this machine. The A2100 control is not supported very well anymore, and it may be difficult to get customer service if you ever need it. Secondly, being Windows based, the control is prone to problems. Our hard drive recently failed, thankfully we had a backup, but i've heard horror stories from people losing their hard drives and having to reload the machine from scratch.
Hope this little bit of info helps. I know our machine pretty well, if you need any more info just drop me a line.