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Can't go wrong with OWC. I do believe there are alternative ExpressCards out there that offer two eSATA ports though.
 
I have one. it works ok, but I only get about 5 mpbs faster transfer speeds than FW800. Unless you are using esata with an SSD, don't waste your money in my opinion. FW800 also has bus power, where as you still need to power an eSata device
 
Thanks, it was frustrating to look for good external eSATA hdds since they where all so ugly and I kinda hated the external power method.
 
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