Well....  Poser is supposed to have problems with ngons.  I don't use them in my work, but I own a dress that has ngons for button holes.  It works OK, but that may be because of the size of the ngons (small).   That said, tris can be worse because they have to involve poles and ngons might not.  I really wouldn't use them as you have because you can often see problems after subdividing.   For example, the cushions in this image of mine (warning: nudity!).  It was my first or second time modeling in Blender, and I had a lot to learn about topology.

I really like how this is coming out!