I have tried a number of iPhone holsters and this is the best one I have found yet. Here are some things I like about it;

1) The flap is held closed by a magnet, Velcro works too, but it gets dirty, this stays nice and clean and stays closed well.
2) This unit has three straps to hold this to your belt, two loops with a clip in between. I use all three at the same time as this holds the unit as close as possible to your belt. Holsters with a single clip tend to get the end of the holster caught on things as the ends stick out. If you are the maker of a holster of this style, make sure the loops are firmly attached and can withstand a lot of pull as the holster gets caught on things like the edge of a door or the seat of a car.
3) I had another brand of the same style, and the loops ripped off the back after only a few weeks. This one has lasted a good three months, and seems fine.
4) I can flip it open and pull out the iPhone with one hand, any holster not set up for that is not worth buying.
5) The holster protects my iPhone well, it is very sturdy.
6) The corners are open letting the earbud jack be exposed. This is great as you can crank up some tunes, or get on a call and re-holster the iPhone with the earbud cord coming out the edge. Hence I can holster my iPhone nice and safe and be on a call or listening to music.

All in all, I like this holster.
I have tried a number of iPhone holsters and this is the best one I have found yet. Here are some things I like about it;

1) The flap is held closed by a magnet, Velcro works too, but it gets dirty, this stays nice and clean and stays closed well. 2) This unit has three straps to hold this to your belt, two loops with a clip in between. I use all three at the same time as this holds the unit as close as possible to your belt. Holsters with a single clip tend to get the end of the holster caught on things as the ends stick out. If you are the maker of a holster of this style, make sure the loops are firmly attached and can withstand a lot of pull as the holster gets caught on things like the edge of a door or the seat of a car. 3) I had another brand of the same style, and the loops ripped off the back after only a few weeks. This one has lasted a good three months, and seems fine. 4) I can flip it open and pull out the iPhone with one hand, any holster not set up for that is not worth buying. 5) The holster protects my iPhone well, it is very sturdy. 6) The corners are open letting the earbud jack be exposed. This is great as you can crank up some tunes, or get on a call and re-holster the iPhone with the earbud cord coming out the edge. Hence I can holster my iPhone nice and safe and be on a call or listening to music. All in all, I like this holster.