Started with EQ5, now using EQ6. Pretty much every quilt I put together has been previewed and tweaked in EQ.
The EQ site has monthly downloads of new fabric collections, lots of lessons, mystery quilts (learn as you go) and lots of ways to learn new ways to use the software.
You can scan fabric and add it that way, and many of the manufacturers have graphics that you can download and import into EQ.
I've loved it, am enjoying still learning with it. Interesting thing I found, I look at quilts differently now - as in, I'll bet that complex block breaks down into something I can figure out and play with in EQ :)
Bonus feature - you can export designs (blocks, quilts) as graphic files.