Cloud Block Storage is an excellent option for you if you:   

• Want more control over your storage or application infrastructure
• Are looking for a higher performance storage option (SSD)
• Are currently using Rackspace next generation Cloud Servers
• Would like to add additional storage to your servers without paying for additional compute resources

You might not be a good fit for the Cloud Block Storage service if you:

• Are a Legacy Cloud Customer
• Are not comfortable with low-level system administration tasks, such as installing file systems, mounting and partitioning storage volumes, or installing your own applications on top of a raw storage device
• Are looking for a fully managed storage or database solution