I have a pile of midi grooves that came with the kits and still have yet to use even one groove out of them. My goal is to soon sit down and create a complete drum track using these things. I would like to use some of the rolls and fills but I just haven't the time usually to get that involved. A lot of my work for clients is just too custom to the point of bread and butter grooves just won't work and the midi grooves I have are so busy and over the edge that they are just unusable. The few times I tried to use them, I spent more time cutting and dragging and trimming and aligning. Well, It would have been less headache just to go ahead and write it myself.
That being said, I will get this Jazz midipak as it sounds very promising in useable content.