I ran a K199 for 20 plus years. First, the good: The control is AWESOME, powerfull and user friendly.
Now the bad: Simultaneous machining is a nightmare. With the head, head configuration you use a ton of space to get to the sides of a block, as huge as the table is on the K199, you can only get 90 degrees around on a part about the size of a grapefruit. Then there are all the head reconfigurations to deal with which is a programming nightmare. Think of the head head config as a 3 plus two machine, at best. Surface finish is horrible when spinning the head and machining, at least for us doing moldmaking work. Tool center point management is difficult to keep decent, at best we averaged about .0015 inches thru the entire range, which is horrible. The Hermle C42 I'm on now stays about .003-.007 mm all day, every day. The service is an absolute joke, they go thru guys like crazy, and all the good ones I know from the past are long gone. The thing eats up spindle drives at $11k a pop like they are running out of style. We dumped our K199 for rock bottom price and we are happy it's gone every day. I have a folder with all the service files that is almost an inch thick, seriously not kidding. I do like the control better than the Heidenhain however.