They are probably not for the person who wants furious detail and precision, but for the average railroader, they do the job populating your trains and look good in motion without picking your pocket excessively. I feel that most of the designs produced to date are colorful and well printed; they add a nice variety to my trains.
I found that a couple of my Menards flatcars seemed top heavy but adding a bit of weight to the chassis helped. This is easy and adding weight low on the car is an old-school cure for smoothing out performance of any rolling stock.
Why not buy one and decide for yourself? I'd imagine that many people would take it off your hands if you don't care for it.
