the free ones that get posted to people these days are pathetic.
they take 2-3 second before they light up and ive also had one die after only a few months :S
some i had posted to me around 5 years ago are much better quality than the newer ones that seem to have been profit margin squeezed
Despite all that, I do try to use them wherever possible - even if only because I know that it would upset Jeremy Clarkson
I don't know where you read this but I followed a lifecycle analysis in The International Journal of Life Cycle Assessment and the conclusion was the quantity of mercury in the bulb compared to the amount in the coal was about the same. Both bulbs use roughly the same energy and resources to make except the energy saver uses significantly less energy overall. The light output of the energy saver was noted to be slightly less than the 'equivalent' 60W and 100W bulbs, which is compensated by increasing the power slightly. If you look at the better quality models they are higher power than the cheap ones and light up quicker.It's also worth noting that if you use a normal bulb, the coal fired powerstations that make up a fair percentage of our power supply will release many times the mercury than is used in the energy saving bulbs, providing the power for the normal bulb compared to the energy saving ones
The one thing against energy saving light bulbs is that they do not work with the lights that have say three different light settings.
:/
In our place they don’t work with a dimmer switch or a security timer switch.

total rubbish they dont last long had 3 go on me and each of them lasted around 6 months. plus they arnt eviromentally friendly, the contain mercury,
Not yet had an energy saver blow on me. Maybe it's the circuits in your house? Though to understand that would need to know how often you go through normal bulbs. Tesco have an offer on at the moment, 5 energy savers for £1. Pretty cheap if you ask me.