I have been using Kettle almost every day for about 8 months now in my job and love the tool that has been created. It is my first exposure to an ETL product but having talked to others about ones they have tried it seems like one of the more developed tools out there.

I was recently asked by a local LUG to give a small presentation on my experience with Kettle as an ETL product. I want to show off some of the things that maybe separates Kettle from other products or things that are just really useful. But I feel like I haven't nearly tapped all the things that Kettle can do.

So the question I wanted to ask is what are your favorite features of Kettle? What do you think distinguishes it from other open (or closed) source ETL products? If you had to sell someone on how good it is what would you show them?