From what I've heard/read, it seems to be a good thing for some states.

I couldn't see Maine adopting this though - it just wouldn't work. Where I hunt in northern Maine, young bucks make up the majority of the deer harvest. The reason behind this is it's bucks only (actually they gave out like 75 doe permits this year, but the chances of drawing one are slim). If they were to put antler restrictions in place, the deer harvest would go WAY down. All of the pressure would be on the mature bucks, making it even more difficult for hunters. This would likely result in lots of frustrated hunters unable to fill their tags, and less people buying licenses in the following years. With deer densities of 2 or less per square mile in places, and does being off limits, it would be absurd to put antler restrictions in place. The southern parts of the state are different, and in some areas it may work but I doubt many people would support the idea. I know I wouldn't!

Just trying to point out that each state - even different counties, are different and what works in one area doesn't/wouldn't work everywhere.