Conclusion: If you know you need this insanely fast, Mac-centric Thunderbolt drive, you need the 12TB Promise Pegasus R6 external hard drive. For everyone else, this is a pricey experiment into how much you can spend for a lot of speedy hard drive storage.
Pros: Copious storage. Faster throughput than an internal SSD. Can be daisy chained.
Cons: Pricey initial investment. Only Thunderbolt interface. Only works with new Macs that have a Thunderbolt port.
Summary: Promise Technology is onto a good thing. Thanks to the company’s quick support of Intel’s Thunderbolt technology, its RAID storage solutions are currently the favoured storage accessory offered by Apple on its online store—even though LaCie is also present.