Ani's blog post defines my position exactly. 100% (See link above.)
Because it states and explains the reasoning of the numerous points so very well, I'm hard-pressed to think of any other facet. But I had to try to come up with one , so here it is.

Though I use both (though far more often "am"), I do try to note those who use "have" and defer to their preference as a courtesy when talking with them. A secondary reason is that I've observed that those who consistently use "have" tend to feel way more strongly about it. And I'd rather not risk being taken to task over it. Because the only thing I feel strongly about is that people should be free to choose for themselves. So it's not as if I'm going to be able to be "convinced" that only one term is acceptable.