I read several reviews of pop filters on Amazon and was surprised by how dissatisfied many were.  Finally I just went with this one and I'm pretty happy with it.  It seems quite servicable.  It is a double filter and attaches to my stand well enough.  The arm is just a little weak butit does stay put if you just don't bump it.  I guess there is a balance between stiffness and ease of possitioning it.  I think possitioning it would be a little easier if the arm was just a little stiffer.