James,
I view buying locos and rolling stock as a gamble. Yes, I do some research before I buy, but not everyone's opinion is relevant to my garden railway. So if I really want a loco or some piece of rolling stock, I'll take the chance. And there have been those times where the purchase just doesn't work for me for various reasons. The most common reason to jettison something is that it didn't earn it's keep. If I have to tinker with it too much, it's getting a pink slip. Other reasons to give an item the axe is that it didn't make me feel good watching it in my garden railway.
By and large, I have had excellent success with LGB products. Not all of which I still own. Bachmann's Davenports are still on my roster as they do work hard. Anything else I experimented with from Bachmann was a bust. Aristocraft was given up a long time ago. I did purchase my first USA loco, a 44 ton switcher. I purchased new motor blocks for it and rebuilt it. I can say that I wish I hadn't sold it. But when you gamble, you must be prepared for some losses.