I would like to pick up on a point made by a previous reviewer about this album. Firstly I disagree strongly Elvis' period at Sun Records was his best, heck he only made 6 singles with the label. The majority of the tracks on this set are much finer.
Furthermore, the reason their are no Sun singles here is because an album of this kind is meant to capture hit's, not early obscurities, not rarity's, not the b-side you liked to a number 1 single, not those album cuts that never got out as singles.
Now some acts Greatest Hit's do do that (reason: They didn't have enough hit's). There are plenty of Presley compilations of Sun Material. So, if you want the sun stuff, you can get one of those. If you want the hit's, they you buy an album like this. If you want the "That's the way it is" album, you buy that, if you want all three, well you get all three.