Alberto.
Now that you have read all the reasons WHY, go into a Cabell's or Bass Pro and tell the clerk that you want to try several PFDs.
The big thing is find an open area, if possible, and pick up a fly rod and try moving it in a casting motion. The clerk should let
you try different PFDs. The big thing I found is find one that is comfortable while you are casting. Getting it right the first time
makes all the difference in the world, comfort wise, especially if you are going to be out casting for a long time. The other big
thing is when you are on the water WARE IT !

Crunchy