I did it and it works for me. The automatic import into Unity does NOT work yet, but you can use the fbx export in Blender 2.53. I had no problems so far, that were not there with 2.49b.
Personally, I consider that a huge problem. I think somebody said they got it working, but 2.5.3 wouldn’t even respond to my scroll wheel when I turned it on so I just deleted it.
Hi Jessy
I had the same problem with a scroll wheel (button press with it didn’t work as well), but it was not my one, so it wasn’t a big deal for myself.
Certainly automatic import would be nice. When I tried 2.5, I became comfortable with it. Now I don’t want to change back.
At the end it depends on what you prefer.
I’m using Blender 2.5.x (I build my own from SVN) and I have no problems getting assets from Blender to Unity. UVs, animation, armatures, meshes the whole lot goes through.
The only problem I have is Blender being Z-up and Unity being Y-up, a problem I’m slowly but surely fixing in Blender (when my results are perfected I’ll share it with the community).
Why not usable? Did you face other problems? Certainly the auto import for Unity does not yet work, but with that exception I didn’t have problems that were not present in 2.49b.