Stay away from any cases with the velcro closure on the end. The full length zipper cases are much easier to clean out the mud and dirt and can be opened all the way up to dry. I used to put my end loader case on my boot/wader dryer, but the case that opens up is much better. Either type will float-both types will get wet if in the water more than a second or two.
Heh, pros and cons to everything I guess. The zipper on mine broke last weekend after only 2 seasons. Maybe a fluke, dunno...
I hadn't really thought about the closed ones being hard to dry. That's a good point, but hopefully you aren't using the floating feature of it very often.