On the PA80, I know what you mean about the 2 fill limitation, but you can get around it by also using the endings and intros as fills and breaks. Depends on the style, but I seem to be able to make many quite lifelike, where if I only used the fills it wouldn't do the job. I like the way you can hit a end or intro in a song and then just hit the variation button and it will go right back to the style without completing the end or intro.