Quote - Morkonan  is there a problem transitioning Poser files to the free modeling programs like Blender -   and likewise, Blender files to Poser.....
I heard it was tricky  including the fact that Poser is scaled smaller  and this down the road causes problems. 
In other words,  would I need to worry   if my goal is  to  bring Poser or Daz figures into , particularly, Blender- do some major morphing, and then  bring these morphed figues  back to Poser7  to pose and render.

No, there is nothing terribly tricky about doing that.

They're based on wavefront .obj files.  If you can import those, you can import Poser meshes.  Scaling is not an issue if you have a program that can scale import/export.  Even then, using something like "Objaction Scaler" ( a third-party, free application, just do a google on it, I think it's at Morphography) you won't even need to worry about that.

The only "tricky" part is that "Grouping" breaks wavefront.obj meshes into separate, independent bunches of mesh within the same object.  So, for instance:

Let's say you want to turn V4 into an Ogre.  That can be done!  In fact, you can grab her mesh and import it into a 3D app using any number of tutorials.  It's easy.  The tricky part comes when you end up not having one contiguous object to deal with but a number of smaller, independent meshes called "head", "neck", "chest", "hip" etc...  They are all "V4" but they are no longer contiguous - Grouping has split the mesh.

There are ways to get around some of the problems that causes.  Saving the original UV coordinates from V4 then assigning everything to the same group, exporting a new model, working on it in the application and then reassigning the old UVs to it will allow you to use tools like "soft selection" across groups and you'll easily be able to get vertices to align with each other using specific tools.  You can use UVMapper Classic (it's free) to accomplish that.  BUT, that method won't give you one, contiguous mesh like some applications can - ZBrush, Mudbox ( I think) etc..   Those are "expensive" bits of software.

Can you import, work with and export useable morphs fairly easily?  Sure you can!  It's very, very easy to do.  However, it DOES take practice to get really, really good results.  But, anyone dedicated enough to start trying to do that can easily get "good" results in their first session with a 3D application and an imported Poser figure mesh.  No foolin'.. .it's easy.  Doing it "well" is what is difficult. :)