Pros: Enabled me to add additional eSATA devices... my motherboard had one eSATA port and I needed more... this gave me four more eSATA ports. Their tech support actually answers emails in a timely manner if you have a problem. I would have given 5 stars but I had some problems, but it is a good product and I would buy it again.

Cons: The installation CD had some disk version number or MAC driver version number only printed on it, and based on an earlier review here saying the Windows driver wasn't included, I thought I had to download the driver which was no problem, but later I discovered it was on the CD after all. The readme directions were not accurate... it said the driver was signed and it turns out only the Vista driver is signed and not the XP one making me wonder if the driver was the correct one when I got the unsigned driver message, and particularly after the card in Device Manager was called not "Tempo SATA E4P" as the directions said it would be called, was identified as"Sonnet Temp SATA Gen 2 PCI Express Adapter", and also after it appeared to not function... the reason turned out to not be Sonnet's fault... see below. I was also surprised at how careful I needed to be when tightening the mounting screw as the card would twist if I tightened the screw too much... no other card has ever done that!

Overall Review: The card appearing to not function turned out to be caused by the super garbage quality Thermaltake eSATA cables that I had, and I had to loosen the mounting screw to the card and plug the cables into it first, jiggle the cable around to seat it... as the plug was so fat it would overlap the socket and the metal of the case dividing one slot from another, and wouldn't allow the plug to seat and connect properly unless you removed the card mounting screw, pushed the card to one side, seated the cable, and then tightened the card mounting screw with the cable in place. Too bad NewEgg doesn't carry the high quality Sonnet locking eSATA cables that have a locking screw device to hold them securely in place, or even the SIIG cables that seem to be high quality accoring to other reviewers, as I would have included those in my order if they had been available instead of now having to order them separately from Sonnet or SIIG and pay more shipping. Please stock those NewEgg!