Originally Posted by rsteinmetz70112

This does not match my experience (26 flights last year).

They may question you about a wheeled bag, but it it fits the sizer (with nothing sticking out at all including straps, wheels and handles) you should be good to go.

I haven't seen gate agents checking very much and once on the plane the FAs don't seem to care where you put your stuff. The overhead bins are almost always nearly empty.