No issues with mine, granted I haven't really run it a ton but I've put maybe 2 hours total on mine since buying it at York in April, very well done little car. Very happy I bought it. Even more so this one seems to run cool and not overheat like many (but not all) of my other Williams locos.
No issues with the trucks but I remember the display model I saw at York, at the vender booth I purchased it, had a chunk out of the side frame missing. Didn't think much about it at the time. I've seen a photo or two from one of the dealers with a similar chunk missing (perhaps same dealer and car for their website, don't remember).
