I have been using 11 W GU10s for some time. My experience with Pro-lite has been much better than with Megaman. Some of the Megaman bulbs blew after a relatively short time. No Pro-lite have gone. The one that did not work was replaced by the supplier at once. The cheapest I have found is on the site http://www.wydels.co.uk/product_subcat.asp?typeID=42&SubID=160 at £56.06 for 10. However I have now ordered Eveready bulbs, relying in part on the good name, which were cheaper at £105.60 for 20 including delivery and which have a much longer claimed life. The supplier was www.inkandstuff.co.uk.