Hi @Sunile Manjee.
It's a bit more fully featured than that, Wandisco solutions generally operate at a level above the underlying service, so if one of the HBase clusters dies, the users don't notice any change, the second area of significant importance is Wandisco's solution ability to handle significant distances between clusters, where as standard HBase replication is usually within the same datacentre or only via very fast links, not full geo replication.
https://www.wandisco.com/product/fusion-active-active-hbase
They also have a webinar on HBase, the final section is all about using Fusion Active HBase across multiple datacentres:
http://www.wandisco.com/webinar/replay/hadoop-hbase-depth
Hope that helps!