Had an Thompson once. One of Auto Ordnance/Kahr's 1927A1 models. I had approximately two good days with it. First was when I bought it second, second was when I traded for a Taylor's '73.
Too many compromises for my taste. If I shell out better than a grand for something that's already a compromise, it better work. If it doesn't work AND it has a long barrel, requires an adult male to use both hands to get the bolt open, and includes a drum that runs for all of two reloads before going out of commission...forget it.
You couldn't give me one of the things at this point.
If I ever feel the compulsion for another big, heavy, archaic autoloader, I'm saving my money and tracking down or building a BAR instead.