So, after reading all over the web there is such a mix of opinions of whether or not mining can still be worth it.

Here's what I'm wondering. The Antminers keep coming out and don't even ship for months. To me it seems like by the time you get one the difficulty will make it only profitable for a short time or obsolete very soon. Is it even worth purchasing one or these or what? Let's assume electricity is cheap or even free.