Interesting comments all. I find that 99% of "tuckable" holsters will print in one way or another. With some body shapes it may be less apparent.
If you find one that is totally concealed, have someone check the belt clips, which is another dead giveaway.
Lastly take that UNLOADED tucked firearm and try to draw quickly with one hand.
Personally, when wearing lightweight wool pants or a sportcoat which it may have to come off for whatever reason, a front pocket is a MUCH better option for me.
My 340pd or Kahr PM9 in a quality pocket holster is totally concealed and very easy to present if needed.
I find my Shield is marginal for front pocket carry.