The semi-auto Thompson more or less occupies the same place as the replicas of the Colt single action and the various Winchester lever actions: A shooting replica of an historical firearm.
Since originals are illegal to own without lots of paper work, and are simply banned in some areas, the semi-auto replica is as close as possible to the original and still be legal to own most places.
Like the original Thompson Submachine Gun, the semi is HEAVY, BULKY, and somewhat clumsy.
It's made of solid milled steel and American walnut, like the original, so it is heavy.
It's not a target rifle, a hunting rifle, a home defense rifle, or the latest in assault weapons. It was intended to be a "fun gun" and it more than meets that criteria.