I have the C&F's you mention. I use the flip one to hold smaller nymphs and the one w/o the flip to hold dries. Seems to work pretty well for me. I plan to get one more of the larger ones (http://solutions.3m.com/wps/portal/3...RowWaterproof/) to hold streamers on one side and larger nymphs/stones on the other side.

The micro slit foam can't be beat. They are spendy though!