Excellent solution for my Mac Pro 3.1, something I've been looking for for quite some time. Previous cards - Startek, etc. - failed within a short period. I've only had this for a few months but it seems solid. Having said that, it doesn't work with some enclosures via eSata, such as my Icybox. I thought the interface was knackered but connected it to my PC and it worked perfectly, so definitely the card.