[HungryBear]

i'd say not. Sometimes they have made me nervous that i'm not going to get good contact, so that would probably cause me to tense up & make a poorer swing than i would have, that's not concentration obviously. - that's fear

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Don't know how that applies to your situation ?

My bad. Wrong word. Maybe should say intention rather than concentration.

Let me give my anecdotal example.

I have/had used a Burke "pga" putter (very like the "save-a shot" model)- it has a sweet spot about a silly millimeter wide. I have filed a mark to make the sweet spot easy to find.
I have changed to an inertial putter- broad sweet spot. Both putters same length, lie and grip. I often take out the Burke and practice stroke. When repeatable contact returns (on the sweet spot) I go back to the inertial.
Maybe CB's have made me sloppy and that sweet spot "intention" is something only to be regained with blades.

Just my concern???

HB