I have one, I think they work great for hunting, but I shoot a tad bit more accurate with a small peep sight beyond 30 yards.

The great thing is this device can train you to have a more consistant anchor and grip. After using it for a while I don't even need a peep sight or the No Peep for shots out to 40 yards or so.

As far as not being in line with the arrow, it really doesn't matter. You will have to move your sights slightly to make up for it though. You can't just take your peep out and shoot to the side of the string with the same sight setting. I actually prefer it to looking thru the string, it's more comfortable to me. That is the only thing I don't like about using a peep, it is uncomfortable for my eye if I touch the string to my nose. I sort of have to cross my eye. I never noticed until I shot without it. The first time I tried it I thought "Wow that is so much more comfortable to look at my sights this way.

I walk back tuned mine afterwards though and all was well.

Paul