I recently have been working on getting Zbrush more in to my workflow. I would say, I have less then 10 hours or so in Zbrush and so far, I really like it. It speed things up, then having to do the old way/sub-d way and I wanted to do some weapon attachments and here are a few of them for now, will post more soon.
Modeling - Blender
High RES - Zbrush