Screwdowns have ben discussed before but in my opinion they are a fine way to protect and display some of your nicer cards. Like all manner of ways to display and protect cards you need to be careful in the way you use them.
The first thing is to not tightened the screws all the way down. The plastic case needs to be firm enough to keep the card from sliding around but not so tight that it crimps the corners.
The next thing, like all cards, is how and where to store them. If they are going to be in a box in an attic or basement then the temperature fluxuation an humidity difference can make part or all of the card's surface stick to the case which obviously can cause huge problems down the road.
A room with controlled temperature, humidity and light is the best place for them.
I have personally seen Chris' (campyfan) collection and he knows how to use them properly. He has dozens of cards stored and displayed in them. Look at the photos of his card room on his page if you want to see an impressive way to display a collection.
They are not for everyone but if use right I have never had any issue with any of them.
Drew
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