I have seen them mentioned on MN, but don't know anyone who has one.
I have some vague idea that I can use them to clean a tile floor, but also tile grout, the oven, shower surrounds etc. Is that true ? How do they work on plastic (thinking of the seal bit around the shower tray/door) ? Is the steam too hot for some things ? How do they work in hard water areas - do they need distilled water ? Do they anything to get rid of hardness on taps for example.