If you've been thinking about storage, you've read the stories and seen the reviews; SSDs are hot right now. Not only do they offer tremendous performance and easily outperform hard disk drives, they are more reliable, their prices are dropping and you can get more capacity than ever. If you've got a Mac Pro or Windows desktop computer, you could just get a couple of 2.5" SSDs and install them in some empty drive bays (if there are any) and be done with it - but the 3 Gbps SATA interface in your computer won't support fast 6 Gbps SSDs at full speed. You could also get a 6 Gbps eSATA adapter plus external mount SSD storage, but they come with the excess baggage of power adapters and cable clutter. Sonnet engineered a great alternative - Tempo SSD.
Unlike other PCI Express SSD cards that rely on proprietary, premium priced SSD modules, Tempo SSD uses standard 2.5" SATA drives that you choose. You get to select from the widest variety of SSDs, and buy the ones that best suit your capacity and performance needs while working within your budget.