Just a quick note to say that I've been making morphs using Blender since 2.48 and I've only had one hiccup when they made the big change from 2.4x to 2.5x and just about everything stopped working for a while.  Other than that, Blender's .obj I/O has been rock solid and incredibly predictable for me.  I've never, for instance, had the slight position problem Afrodite-Ohki has had, and I scale up after import and scale down before export.

I've even been able to save my presets for exporting figures, props, and morphs.  Though I know RobynsVeil had a problem with that at one point, I think that was a bit back in 2.5 versions.

But I'm still on 2.58 because it works for me and I don't want to spend time trying to get everything the way I like it in 2.6x yet.   So I know the value of a tried and true workflow.  This is just an FYI.