I am a big fan of using construction lines to define sketchs, this seems to work as expected but sometimes when I go to select an area it can be split by the construction line. I can work around this, but it's incredibly inconvenient especially when the sketches become more complex. Here is a screen cap of what I am talking about:
Edit: I am primarily concerned with the region selection using the split region of the construction line. There is only one construction line along the middle.