I am UP-GRADING my opinion of these things. I wore them to work today and had them in all day. I have to tell you that I actually felt a lot better. There were quite a few times that I caught myself taking a deep breath that was really satisfying. It felt so good that I would notice right away. These things definitely help me. I know we are all different but for me, it is very noticeable.
I messed around making clips and inserts and mine do help in various ways, but I really think it is the cork screw and the twist it gives the air such that it is more presentable to the rest of the nose rather than laminar right in and right through. It helps me with dryness and sensation. I would recommend trying these. When I first put them in, I thought, OK, nice... I sniffed and expected some big change. It was subtle and cumulative.