i have QDW and one thing i know it CAN'T do is let you import your own fabrics. i wanted to see some fabrics i purchased in a design and you can't do it. i read it somewhere on the EQ site, which finally put an end to my frustration of trying to figure out how to import the graphics. :(
and no, you can't design your own blocks. there are lots and lots of those out there with their projects that are published monthly, but you have to open the project and save what you like (fabric/blocks) to your favorites. i just started doing that the other day.
also, it's limited on size of quilts, but i read where you can customize your own sizes in, but i haven't figured out how yet (placemats, for example).
if i ever get more serious about this (designing), i'll get the EQ software. but for now my $15 QDW is good enough for me.