So far so good!  These fit well in all my G9 specific light fixtures.  For us they are mostly in our bathroom light fixtures.  I choose the 25W ones because the 40W ones are damn bright.  As some reviewers have noted you have to be careful not to touch the glass as I believe the grease/dirt from your hands reduces some of the life of the bulb, maybe?  Either way doesn't take much to use a toilet paper "square" and avoid touching the bulb when you insert it in.  For use so far (its bee maybe 2 weeks) they are working fine and give enough light that we feel it was a  good purchase.  Good luck!