Anyone ever use a laser to put your arrows on a center shot,?, i've been thinking of getting that "Laser Eze" device,,it looks like you can get pretty darn close to centering with one of those. Seems as though the beam could be aimed to your nocked point then swivel the beam to your rest (where you could adjust the rest) such as a "Whisker" and then to arrow tip putting all in tune.

Gives you an orientation point, but it's not gospel.
All bow risers are perfectly square outside the sight window--and the laser tracks off the riser.
But it works, still you'll have to fiddle for the best set-up.

Geez--I left out the word NOT--this should follow the word 'are'.

I got one and use it all the time. It works better than what you describe. I shoot the string at the nocking point and then turn it clear to the tip of the arrow. Much longer radius makes for more accurate setting.

herd of that for a gun but not for a bow

That's because you ain't been around long enough to learn all the "stuff".

I didn't get to see one of these in action. Can you come to full draw with this unit on the bow? Center shot doesn't do you much good on a relaxed bow other than to find a reference point. Once your at full draw, allignment, cam position and a small amount of limb twist will alter the point of center shot. I would like to see how these work.

This is why in my post above I mentioned that the Laser light will give you an orentation point to start.
However, you'll have to adjust the windage and sometimes launcher height manually, to attain exactly what you're trying to achieve.

If using this laser tuning device would make your bow set up shoot a perfect bullet hole through paper every time then it would be worth having, but if it doesn't and you have to move your rest to get a bullet hole then I would say the device is a waste of money.

It will not work on Hoyt bows because they have their riser built a certain way to compansate for the cable guard. It is best to just line it up by eye and paper tune or do the walkback test