They're a relatively well-known company, currently owned by LogMeIn, though that seems like it will be changing. It's definitely not some solo person's side project or anything. They're one of the most well-known names (whether good or bad) in the password manager category.
While they have had security trouble in the past- they're big enough that it's not surprising at all to me that many people, including those on HN, are their customers.
I would also not be surprised if they lose a chunk of tech-savvy customers over this- as they should.