Pros None - cannot use device as designed, marketed or sold.
Cons Seagate Manager software cannot be used on a Dell system using eSata.
Summary Spent several hours troubleshooting earlier today on the 1.5 TB version and seagate came to the conclusion that their Seagate Manager software is not compatible with the Dell eSata which means that power management, configuration, RAID, etc., cannot be used unless connected to slower ports such as firewire or USB. There are several other eSata drivers, etc., that the Seagate Manager cannot play nice with but that information tends to be hidden until after purchase.
There is reduced operability of this device via eSata on a Dell using the Vista interfaces such as Windows Explorer but drive will stay on 100% of time with fans constantly running, etc.