In 1994 I purchased a GG1 from American Models because I've always liked the design and the Lionel ones were horribly foreshortened. I could never bring myself to try three rail O anyway since I've had S ever since 1956 when my Dad got me a Silver Rocket set that set him back a pretty penny in those days. Since that initial purchase, I've been a steady customer and booster of his enterprise. Also the GG1 has given yeoman service ever since and has undergone modifications including directional lights and working marker lights. I've also configured it to run on AC or DC via a DPDT switch or two and swapping out scale wheels for use on scale trackage. I've worn the wipers off the wheels and have replaced them. That plus a periodic lubrication has been all it's needed.
Here it is pulling every PRR passenger car I own on my club's (Southeastern Michigan S Gaugers) layout a few years ago:
