I think you mean EQ. I have 7, having upgraded from 6, and can't see all that much difference, except in the policy for installing the software. Read the information on installation on the EQ website for details. Also be aware that if you buy a used version of EQ6, you may not be able to install it, or the number of remaining installations may be limited. The other advantage of buying the latest software is that you will be able to upgrade from 7 to 8 at a greatly reduced cost when 8 comes out, and I'm sure it will, but the cost to upgrade from 6 to 8 will be much higher.