Mike,
My car is a work in progress and I intend to remove the trip pin, add brake lines and cut levers. My point is that while some get all worked up about particular details aren't there or the level of detail. If you are going to go down that road, then ... it's Ow5 folks, there is a MAJOR GLARING detail that is wrong ... the gauge of the wheels. Now, it may not worry you, and that's fine, but the wheel size and gauge is a detail you can see. The underbody detail on a car like this should be invisible, unless the car derails. Now, if I were scatchbuilding the model, that would be different. I will add the sundry details on the railgon I'm working on, but on a massed produced model that looks real nice and is accurate for the most part. I don't have a problem with this car. I would love to see another General Purpose 50' tank car, beyond the 25.5k trinity that Atlas made, but I am happy with that car too.
The problem with THOSE cars, unlike this one, is that for it to really look realistic, a lot more work needs to be done, because the bolster is readily visible, beyond the end of the car. The Lionel Aluminum ACF Covered Hoppers are another example of a really nicely done series of cars that don't require much to look good, whereas the Atlas 5161 Covered Hoppers are a lot more involved ... to do right.
I said it previously in this post, Modern O Scale\Proto48 is in the same place (actually a little worse) that HO was in in the 70-80s. We should be happy when anyone comes out with anything new, particularly with the level of detail they are trying to put into the models. Kudos to Lionel for trying because their clientele ... the people who pay their bills, don't care three licks about whether a car has the correct underframe details ... or any at all. They would probably sell more Beeps with Micky Mouse hanging out of the cab hurling little plastic presents out of the cab window at random intervals, not with a prototypical 65' modern mill gondola that will have difficulty going around O27 track ...
Jim
Ps - The above comment about Ow5 being said, the modeling in Scratchbuilder1-48's photos is some of the best modern modeling I've seen.