I find it quite surprising that an earlier review of "The Ultimate Collection" 4-CD Set is currently deemed to be this sites 'Most Helpful Customer Review'... Because, IMHO that review is almost entirely inaccurate ! (I refer to the review titled 'Budget edition' dated 27 December 2011) And because of that potentially misleading review, I have written the following.
In response to that earlier review: I strongly suspect that the tracks on this set have been digitally remastered, based on both their clarity and the quality of the bass sound. Additionally, a comparison of the shared tracks on "All-Time Greatest Hits" (which has been digitally remastered) reveals they are identical in quality. As for 'the quality of sound being inferior to other RCA compilations'; it's true, they do not sound quite as good as the versions contained on the CD's "Elv1s 30 #1 Hits" and "Elvis 2nd To None". However, those 2 releases were not only digitally remastered, they were also remixed from the original recordings; which gave them an even greater clarity ("Burning Love" being one of the best examples). But in this case, "The Ultimate Collection" contains the original mixes of the songs, so they sound exactly like they always have. And, as for the comment: 'several tracks on CD 4 are live re-recordings'... Of the 22 tracks on CD4, just four of them are live recordings; "The Wonder Of You" / "An American Trilogy" / "I Just Can't Help Believing" / "Polk Salad Annie". And as the only recordings Elvis ever made of those particular four songs was LIVE IN CONCERT, I hope that earlier reviewer is now devoting his or her time to locating Elvis performing 'non-live re-recordings' of them !
As for my review of this set: This is an excellent 88-track collection, containing the majority of Elvis Presley's biggest hits and most well-known songs. And although it does not state on the packaging that these tracks have been digitally remastered, the sound quality indicates it is very likely that they have been. The accompanying 24-page full-color booklet contains an extensive Elvis biography plus photographs. And my only gripe about this set would be, there is approximately 80 minutes of free space remaining across the 4 discs; which means there could easily have been many more songs included (25-30?). Or alternatively, these 88 tracks could have been contained on just a 3-CD set.