Great review on the autoracks, Scaletrains have the most details, and Walter's is the best bang for your buck. Walters also run better on tight radius curves like 22 inch, which I use due to lack of space.
I have several of the Walters Proto 2000 Southern Pacific auto racks. The are great cars for the money and run great. The only thing that they are really missing are the coupler cut bars and air hoses. You really can’t tell there not there. Maybe next time you can include the Atlas auto racks for review too.