MySQL DB: Good Product
I am recently started using MySQL 5.X database and found that it's a great database to build high performance systems. It has a good sets of tools(easy to use) and nice online documentation. In the past, i have used commercial dbs like Oracle, MS-SQL Server to build products and the current quality of MySQL is as comparable to those commercial products, or even better in few aspects.
The ease of use & stability of MySQL is great.
Yahoo Finance using MySQL shows how stable, reliable the product is...
I would say that if you need a database for your system, take a closer look at MySQL.