Incanter's flow - A thought process. Turn 1 or not?

Something I can't ever decide if it's worth it or not.  When running a primarily spell mage deck, is it right to coin+Incanter's flow on turn 1? Or should you save the coin and wait until turn 2?  The idea being that by coining on turn 1, you are giving a "coin" for all future spells.  Assuming you never float mana, in theory the idea holds merit.  But if you ever find yourself short of one mana, then holding the coin may be better.

Thoughts?

There’s a few factors involved, like what deck are you facing, would you rather Apexis on 4 etc. I’d say most of the time you would almost always coin Incanter’s Flow, unless you are preparing to coin out a Flame Ward or something 

Yea, that's kinda what I thought as well.  It's just one of those plays that I tend to question cause it feels good, but I'm never quite sure if it's the right play.