I think another point is that not all slabs, or companies, are created equally. PCGS is not infallible but generally a bit more credence can be given their grading on milled bits of the 19th and 20h C. versus some of the others, and NGC not too bad generally. The othe American companies occ. leave something to be desired. At least to me, I still need to see a few more CGS coins... Trays definately appear more pleasing to site, but I have seen many a coin mistreated by hamfisted dealers and collectors complete with finger prints, drops, saliva, and worse...Also, no cabinet friction over time in a slab.