As a relatively new technology, storage virtualization products can vary in their maturity. For example, IBM's...
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SVC product and DataCore Software Corp.'s SANsymphony product, along with FalconStor Software Inc. and StoreAge Networking Technologies products, have all been in the market for a long time, and they've added on a complete suite of storage applications on top of the virtualization layer. Even then, there are some applications, like thin provisioning, that are available though homogeneous storage players, like 3PARdata Inc., Compellent Technologies and Xiotech Corp., but may not yet be available from the storage virtualization vendors.
Check out the entire Storage Virtualization FAQ guide.