I hear "What's a Sebo?" quite a lot. It's funny really, as Sebo are kind of secret pioneers. I mean, they were the first upright vacuum ever to incorporate an on-board hose (a feature which is now standard on all vacuums), the first upright ever to feature a clutch controlled brushroll and toothed belt and the first vacuum ever to feature hospital grade, S class filtration and now the whole world is obsessed with HEPA.
To say that Sebo are not that well known, they've made a huge impact on the market.
I'm always impressed when people know who Sebo are. My father in law was incredibly impressed to find I had a Sebo. "Oh, they're good! They use them in a lot of hotels, you know" were his exact words. A colleague of mine knew who they were as well, as her parents had a pub and would use nothing but Sebo cleaners.