I like Acid!
It's the simplest of the DAWs I've seen. Never read the instructions but figured it out the first time I tried. Acid loops just fall into tempo, and it comes with lots of editing capability.
Used to do multi-track recording with Teac and Yamaha machines but it would sometimes take days for me to record with drum machines. With Acid, you can drag a beat out as long as you need it to be in about 3 seconds, then go back later and change the drums to whatever they need to be. Now I can make a demo with drums, bass, couple of guitars, keys, and all the vocals, finishing in about 3 or 4 hours
When writing a song, I don't want to get bogged down with the recording process. So I wanted something easy, since I'm going to take it into a real studio when I'm done. By doing all the pre-production on Acid at home, I saved between 30-40 hours in a studio, not to mention being able to show the idea to musicians that are playing on it.