Just an update on this old thread.
Poser Pro 11 works okay and today you can reduce poly. For export there is an UE4 or UE4.2 preset option. For character animation it is nice for simple things, like a walk designer .
The characters that comes with it are okay, meaning somewhat acceptable out of the box. I have seen really photorealistic stills from the experience users.
Moving around in the 3D space is a little different than UE.
I just did at test, importing a character animation and the animation worked fine, no problems or issues, even for an UE noob, lol.