I saw one of those bulbs, last week in Nijmegen. I thought that it was really different, a light bulb that actually looked like a shade.
The shade that I have is really quite small, more like a shade for a small table/wall lamp than a ceiling lamp. Having said that, I have no idea (shameful, I know) of what sort of sizes of shade were used for what.

Although, it is an ideal size for a small lwater closet, under the stairs.