I personally just think it's way too early for us to really be able to
say much about it. So far the APP implementations that have actually
been deployed seem to work rather consistently in that I can get a
single client (e.g. Abdera) to work with each with very little effort
and only minor variations (e.g. different auth schemes, some require
Content-Length on the post, others don't, some reject invalid entries,
others don't, etc). Based on my experience thus far, I really don't
think it is going to be much of a problem.