EZD was the first drum software that I bought. What I liked about it as a songwriter:
1. The midi grooves are very basic and not overly played.
2. The patterns are very well described and laid out for ease drafting a song.
3. The kit parts were easy to load, change and route to Sonar.
When one first starts using midi, it can be rather intimidating. EZD proved to be a very easy to use training ground for me. I still love the way they layout and describe the patterns, especially the fills, by dividing them into 1/4, 1/2 and full measure fills. The way there lay out and describe the cymbals is also very nice for Verses and Chorus's; no guess work, very fast to lay out.