@hapycakeoven – I have purchased a few of these unique magnetic card cases in special circumstances, primarily for rare cards or cards whose original containment unit was a hard case.
If you ultimately decide to purchase and utilize these special cases, I have discovered that the Ultra Pro Specialty Series Magnetic One-Touch® Cases (35 pt) are an excellent substitute for the majority of hard card storage units. In general, Pokémon Trading Cards are 35 pt (i.e. 35 pt refers to the degree of stock card thickness). I have attempted to utilize other types of hard cases, including screw-down cases – a hard case with a single screw in the top centre of the unit. I personally loathe these cases because they scratch easily and do not offer UV protection. In any circumstance, it is highly recommended that individuals purchase hard cases with recessed cavities; this shields the card from unnecessary and/or asymmetrical pressure.
As @pokeg previously mentioned, PSA offers the best protection jackets in the industry; each casing is virtually waterproof, delivers ultraviolet and physical damage protection, and exhibits minimal or zero internal movement. A negative aspect pertaining to recessed hard cases (including magnetic cases), is the extraneous movement experienced by the card inside. The majority of recessed card holders have excess space around the card edges; your card may receive edge/corner whitening if it is handled too often.
Is it worth it? It depends on personal preference. I honestly do not use hard cases often unless it is a special situation or the card’s initial state was previously encapsulated. I prefer a combination of penny sleeves and top loaders. I recommend purchasing one magnetic case for a test card and observe your feelings towards it. The choice is yours 