franck I Do understand how you feel about zbrush I finally understood how its work even if I would be able to explain what I exactly learn.
But the first advantage of modo over zbrush it's the 3D view and the fact you can paint an entire level. In Zbrush you need to use subtool and for something other than character is not really handy.
this an example of what I create just using modo ( my first experimentation )
http://img255.imageshack.us/my.php?image=armance9nj6.jpghttp://img221.imageshack.us/my.php?image=arm1nv7.jpghttp://img225.imageshack.us/my.php?image=arm2yf8.jpghttp://img137.imageshack.us/img137/5083/armance4bz9.th.jpgI didn't use photoshop for theses but I have to admit that machinery frank and dan silverman were true. I was doing an Hi detailed character I would need photoshop. But for most of the task I belive if you are good enogh in modo you can do almost everything in the package.
I haven't try the latest version of modo ( off my budget for the moment) but it seem to be a good package with a lot of advantage. For the one who are looking to compare modo to another tool Mudboox 2009 sound like a good rival ( I haven't try it yet). Also 3d coat seem like a good tool but I'm getting of topic.
