I have an Ellusionist Arcane Stainless Clip, a black E-Sized porper clip, and the Gun Metal Arcane porper clip. I use the Arcane one the most because it's amazing, but as far as functionality is concerned, the black porper clip is the best. If you are careful taking the cards in and out of the clip, the Arcane Porper will not do any more or less damage to your cards than the regular one, just hit the inside with some sandpaper real quick. It makes sure there are no sharp edges under the Ace cutout that will damage your box.
The Porper clips are magnificent at keeping a deck in good condition, the deck box however, will suffer damage over time. This is just a fact of life. Nothing lasts forever, but the Porper clips will extend the life of your cards.