Question about Lighthouse Quadrum holders

Good idea if you want to go down the more formal track of displaying / storing your coins in trays and a cabinet.
The tray method it often used by museums for their storage. Trays and cabinets is the method that the British Museum uses for storing most of their coins.

The similarities between the Quadrum and Intercept Shield holders is that they are both inert plastic 2x2s, both easily store on a tray made for 2x2s. The inserts are completely different, the IS brand is made of some kind of neutralized fiberboard and fits the coin mm listed on the package exactly. The Quardrum brand is made of volara foam, similar to the rings for Air-Tites, they have some give if the coin is larger than the opening. They seem to be a more attractive holder than the IS, but is relatively difficult to find. Not too many supply houses stock them.