I prefer compartments for dry flies; the choice of box & brand is up to you.

I prefer foam pads for nymphs, the choice of box & brand is up to you.

I don't like clips, I don't like Nubby-Tack or reasonable facsimiles, I don't like fleece or felt, I don't like magnets although they aren't the worse choice.

I never tried the C & F slitted inserts; I guess because I wear a Richardson Box; but if I did I would only use them for nymphs or streamers.

I just feel there are too many things to "smoush" on a dry fly with my fat fingers when trying to stick it in regular or slitted foam.