Although synthetic filters sound appealing to me, I would never get the use out of them unless I left them on for three OCI's. I change my oil every 3-7k regardless of synthetic or conventional (straight dino is on the bottom end of that scale, synthetic on the high end, blends around the 5k area).
I like the Napa Gold, they are built well and when I don't have Pure One available I use them. I'll usually keep the filter on for two OCI's or one if I'm doing a synthetic/winter drain interval.