I've been using the same pair of Firstgear Mesh Sport gloves (in silver/black) most of the year since 2003. An excellent product that even made it through my high-side back in 2005! I should buy a back up pair, since these gloves have been so good. Of course I have been saying that since 2003. And other than the inside tag fading that I can't read it anymore. The gloves are still in great shape.
I put about 10,000 miles per year on my bikes. Some times more, some times less. These gloves probably get used 2/3's of the miles I put on the bikes! So I'm estimating 50,000 miles on these gloves and still going strong. And my hands are mostly cool and comfortable in the warmer weather down until we drop back into the 50's!