I know plenty of people with impressive firearm collections, but to my knowledge no one in my circle owns a bump stock.  Of course, if you own one after today, you might end up paying a fine and/or serving some time.

The federal ban is in effect as of 3/26.  This isn't just for new sales, but includes possession.  In other words, you can't be grandfathered in on this regulation.

Maybe I'm wrong, but I don't think these accessories are very popular here; however, if you have one, be warned: There are serious consequences that begin at midnight tonight.  The ATF provided a guide to destroy them here.  If you choose not to destroy yours, hefty fines and up to ten years in prison may be in your future.