I've got more than I can count, due to flyfishing for a lot of different species. I find some are better for small patterns, others for streamers. Cliff boxes are one of the better for both, slotted foam like the C&F. I have a dozen of the Orvis/Morrel foam covered with fabric boxes like UG mentioned. I just filled one this week with patterns for Nov. The mountain trout flies that filled it before went in a tin. For the money, they probably are some of the best. You can buy 3 or 4 for the price of a C&F, or other fancier boxes. I like cheaper for the SR, they get abused, hold lots of simple cheap flies (egg patterns) and you have them out often because of fussy steel/ snags/snap offs/ big fish teeth. They also are crush proof, float and are easy to handle with gloves on in the cold.
Boxes are a lot like rods- depends on preference.