Is this normal/correct? Shingles overhanging drip ege by 1/2" or so

I just had my roof done and it looks like they did a great job. Im a bit confused though about how the shingle is suppose to overhang or line up with the drip edge. Ive seen some roofs where the shingles are trimmed to line up with the drip edge, while other roofs have the shingles extend about 1/2" or so past the drip edge. It seems like the 1/2" overhang would be the way to go. Is both "correct"?

Here is an image I snagged off of google to illustrate what I am talking about. My roof edge looks very similar.

 

As an eavestrougher, that half inch overhang is EXACTLY what i like to see. If a drop of water is rolling down the roof, and it drops cleanly from the shingle to the ground without catching on the fascia in my opinion the roof is perfect.

Too much of an overhang will cause an unsightly looking curl, but a half inch is fine. I know of at least one roofer who overhangs his first row of shingles based on the first knuckle on his middle finger.

To put the shingles flush to the edge of the roof is a terrible thing to do. It will rot your boards and stain your fascia prematurely

 

Yes, that is what I figured happen on my old roof. We had to replace some faschia, subfaschia, and soffit boards. The old drip edge was also rusted pretty badly.

 

I wouldn't have it any other way. That is correct. Politicians in Fla want it flush and cemented down which it wrong twice over.