Mike, I started with EQ5. The very first thing I did with mine was to design a layout for tiles we were installing at the time in a new shower! Not only did I have a lay-out showing the exact size and shape to cut each piece of tile, but also knew what size tile spacers to use!!! SLICK!!! My DH was impressed!
I now have EQ6, but have not upgraded to 7 yet. Absolutely worth the $$$, IMHO. (Lots cheaper than a tile installer!)