I think there might be a typo in the advert, where it says 40W I think that should be 40 minutes which is the average life of these little beauties. I am very happy with the purchase, cheap and quick. I used to clean the top of my kitchen cupboards once a year but now thanks the conveniently short life of these bad boys, I am up there every week to change the bulb and have a quick wipe.
I would definitely order again, in fact I am going to have to order again because I have nearly gone through this pack of ten already. You will go through them, that is a feature of these new eco short life bulbs but you do save money in the long run and help save the planet. I would guess at 20% electricity saving on one of my light fittings as it takes 5 bulbs and at any one time there is always one of the bulbs in eco mode. If, like me you have a strict light fitting maintenance schedule you can always pop another one in at the next inspection.
The product itself is a small glass capsule with bent wires protruding, when the bulb goes into eco mode they can grouped into pairs where they make an interesting and unique pair of earnings, perhaps as a gift. Or keep them in a large jar and while away the long winter evenings counting them and exploring the interesting patterns where the bulbs have expired in a mini supernova of futility and disappointment.