I would own a Thomson, if I was wealthy again, with the Cutts compensator, for historical reference. I wouldn't actually use it. Cleaning would be a stone cold... problem.
Clem and aimed fire work well enough for me and mine.
I believe a semi-auto Thompson is still in production. Cheaper ones have aluminum receivers; steel costs over $1k.
Not likely that I'll pick one up. Have been looking into a mechtech upper for a Clock in .45 caliber though. My son has one for the Clock 9mm and turned it into a sweet shooting little carbine.