My windows operate smoothly, but the screens don't fit all that well. You need to be careful about where you grab the screen door to open or close it, somewhere around the mid point top to bottom, or it won't move smoothly. It doesn't seal all that well at the top when it's closed. I'll work on that when I have some time. The windows screens are pretty much hopeless.
Both the windows and screen door benefit from lubrication. 100% silicone is OK, but wax works better.
I'm getting these in lieu of opening a sliding window at night for ventilation.
Cab Window Inserts