I operate mostly postwar-MPC-Kughn era lionel (all conventional) but have almost by accident accumulated quite a few Rugged Rail (MTH 33- series cars) because they were available and affordable. Upon closer inspection I found them to be well-made, realistic enough for what I run (0-27,fastrack), and matched up well with the engines and other rolling stock I have.
PLUS :
Die-cast trucks, metal wheels/axles.....these things pull easily and track great with the extra weight down low like that, and have a great "clickity-clack" sound over switches and crossovers.
real metal springs in couplers....they work all the time, not just til the elasticity leaves as in plastic sprung couplers
Since my engines are conventional (not scale or anatomicly perfect) these cars look just fine in any consist I choose to run.
Price range (ebay) 10 to 40 dollars asked, most sell in the range you paid, or slightly less if no box, used, visible wear, etc.
MINUS :
Unless your an avid collector/investor, or a true scale fan, I really don't see any negatives.
steam rules
"a country boy can survive"