When the original bulb blew in my 13 year old Hotpoint fridge freezer, I purchased one of these universal replacement bulbs.
While the old bulb was quick and easy to remove, I was fiddling around for a good ten minutes trying to fit this one, but that may just have been because of the awkward angle and the fine thread of the screw fitting. Once it had finally gone in though, it lit up normally and is still going strong - although it awaits to be seen if it lasts 13 years, like its predecessor!
UPDATE 09/04/13: This bulb has been in use for over two and a half years now, and is still working. In February 2013 I ordered a second one for my old Sharp microwave. Both bulbs were ordered from Suds-Online, if that makes any difference.