To test I ordered once one of these bulbs. The brightness is not as equivalent products which are similar in price. My 3 watt bulb from a different manufacturer, illuminates much stronger. What's more, this bulb is buzzing even a little bit, but not necessarily interfere. These are an average lamp which so just met my requirement.
Update 20.12.2013
I had this in my Bedside lamps, by now 9 months went pear after a brief flicker forever from. My old energy-saving lamp was not broken after 8 years.
So can only advise against the purchase. A star is still a praise.