David, As you know I have limited experience with DROs and machining in general. The main reason I like the MX200 is the easy of use and the visibility of the numbers. Not that it is needed but the graphical display on drilling a bolt hole circle for instance is really nice. The display, the MX-200 displays real letter and words, where the MX-100 has the broke up LED type letters some of them almost look like a symbol rather then a letter. On my lathe with the MX100 during the day the light coming in the shop from behind me makes it harder to read the numbers. That and to get to some of the features which I my not have to get to very often are in sub menus that are not as easy as the MX200.
As far as the touch screen goes so far even with light gloves on, I haven't had a problem. I guess time will tell, especially when I get more experience and more confident on what I'm doing. Now I'm measuring twice or more entering the numbers thinking about it and making sure I have the numbers entered right before I ever make the cut. LOL
Tim