Most people that try them and decide against them do so because they have to change their anchor point so the FOB doesn't hit their face.

The real advantage of a FOB doesn't show until around 35+ yards and a strong crosswind. FOBs don't drift as much in a crosswind.

They are also field repairable. Say your shooting 3D and a bud cuts a vane. The arrow is done until you get back to a shop and have it refletched. FOBs can be removed and replaced in seconds.

They are durable but not indestructible.

If you are having flight issues with FOBs it is due to contact issues.

BTW I don't use FOBs. I have 36 of them but the Tribute has been retired. I was in the process of setting it up for FOBs.