I have owned the oval version for quite some time and really like it, hence my purchase of the coastal version. I use them up here in NH for drifting flies and BIG streamers for trout, bass and northern pike.
I plan on using the coastal version which I just received for striped bass fishing. I normally like to use casting floats that you fill with water but find yours much easier to use and weight, or fish with no weight.
. I fish everything from a 2 weight fly rod for native VT brook trout to BIG northern pike and stripers. I would suggest you might have a huge market for your corks if you down scaled some in size for fly fishing, panfish, trout, etc. I love the design and ease of use and being able to change the weight so easily, and would load up on them if they had smaller sizes I could use on brook/brown/rainbow trout and perch/crappie/bluegill.