Funny that you mention this. Just this weekend a friend was helping me dimple some skins with my big 22" c-frame yoke and footpedal operated squeezer. We did one half of the dimples with a Cleaveland set and the other half with an Avery set. Overall there was almost no noticeable difference. One difference I did note was that the Cleaveland's have polished faces and will leave less of a ring around the dimple (less radial scratching). No big deal however.
Dies do wear out and I've found that you don't want to do more than one airplane with them.
