WD My book 1 TB triple interface $249

Saw this today at Costco. This is a single 1 TB drive in an enclosure with triple interface - USB 2 / Firewire / eSata . $249 ($279 less $30 instant rebate). They had plenty at the Santa Clara warehouse. I didn’t take the plunge because I am looking to build a RAID 5 array out of cheaper 750 GB drives , but it was tempting.