I am only familiar with exonumia slabs, most I've seen are NGC's. They seem to have considerable difficulty with the simple tasks of copying information (merchant's name, location/etc.) from the token to the label, and after a number of years now they still have not figured out how to use the rather simple Fuld id system for Civil War tokens. There are certain tokens (made with a certain specific group of die numbers) that they incorrectly id EVERY time they slab one, simply because they are not knowledgable about what they are doing. I find some of their grade assignments hilarious, but that simply falls in line with the quality of the other aspects. Reliable? IMHO, an emphatic NO!