I have a 3-bulb kitchen lamp unit that uses these style bulbs, and it seems to burn out 2-3 bulbs per year.  I got tired of paying ~$5 per bulb from the hardware store, so I gave this seller a shot.  Bulbs are slightly different shape than the "OEM" bulbs, they have a pinch in the middle of the bulb, on both sides, and they are slightly thicker.  But they fit perfectly, and for roughly $1/bulb, it's a great deal.  Now we'll see how long they last.  I've just plugged in 2.