i use my EQ6 for just about every quilt i make.
i haven't even begun to scratch the surface when it comes to using every feature i could but that's because i'm more of a traditional piecer and rarely do applique.
i occasionally wish i hadn't spent the extra money on version 6 because i'm not overly impressed by the way it scales and displays the fabrics i've scanned myself and imported. is it me or the program? i don't really know for sure.
i don't regret buying it. between the thousands of blocks built into the basic software, plus the number of companion programs available for additional pieced blocks, applique and quilting motifs, i think it's a much better value.