I hate to love KDB because its a very expensive closed platform. But if you understand some of the concepts and how easy it is to achieve those concepts with a few lines of q code you can do some brilliant things. Yes, KDB is a great data store and provides very quick methods for crunching that data with its vector-based approach.

However, whats really impressed me with KDB is that you can do so much more with it. In some banks it has effectively become the messaging middleware for connecting hundreds of disparate data sources. In addition to passing messages you get the data storage and analytics tools for free...