The first track to emerge from the duo was "Take Ü There" featuring Canadian musician Kiesza. In an interview with BBC Radio 1's Zane Lowe, Skrillex explained that the making of this song had a unique process: He and Diplo were set to play a show in Ibiza when they saw Canadian pop singer Kiesza perform ahead of them. Impressed with her singing, they asked her to do the vocals for a song. They recorded her in their hotel room and finished the song in one night. During a set at Camp Question Mark of the Burning Man festival (one of eight different sets they played over the course of the festival), the duo played "Take Ü There" along with an unreleased track titled "To Ü", of the electro and future bass genres, featuring vocals from AlunaGeorge. "Beat Steady Knockin'", which features vocals by New Orleans bounce artists Fly Boi Keno, was also played. It was later re-titled "Beats Knockin'" for the album's release.
In early 2015, Jack U played numerous unreleased tracks in a two-hour takeover mix on BBC Radio 1Xtra. Tracks played included "Febreze" featuring 2 Chainz, "Jungle Bae", "Cumbia" featuring Maluca and a new collaboration with Snails entitled "Holla Out". "Febreze", "Jungle Bae" and "Holla Out" were all included on the album, while "Cumbia" featuring Maluca was excluded from the album. Skrillex has also mentioned that Jack U has "got five songs that we made that aren't even released, and we'll end up releasing in 2014". On February 27, 2015, Skrillex and Diplo released the album on iTunes. Alongside the previously revealed six tracks, the album's release included unannounced songs "Where Are Ü Now" featuring Justin Bieber, "Mind" featuring Kai and vocals from Skrillex, "Don't Do Drugs Just Take Some Jack Ü" and a remixed version of "Take Ü There" with Missy Elliott.
"Take Ü There" featuring Kiesza was released as the lead single from the album on October 4, 2014, reaching number sixteen on the UK Dance Chart. "Where Are Ü Now" was released as the second official single simultaneously with the album on February 27, 2015. The song is a collaboration with Canadian musician Justin Bieber. The track has so far reached number 8 on the Billboard Hot 100 and number 3 on the UK Singles Chart, becoming the duo's biggest hit on both charts thus far. Moreover, the song peaked at number three in Australia, currently the highest peak of the single worldwide. The song was hugely successful throughout Europe, reached the top-ten in Sweden and Finland, as well as the top-twenty in Norway, Czech Republic, Denmark and Slovakia. It has also charted in Bieber's native Canada, peaking at number 6. Although not released as an official single, "To Ü" was added to BBC Radio 1Xtra's C-Playlist on 23 March 2015.
The album received positive reviews from music critics. At Metacritic, which gives out a rating out of 100, the album received a score of 70 based on a number of 8 reviews, which says that they were "generally favorable reviews". Also, at Rolling Stone, which gives out a rating out of 5 stars to said criticised albums, the album received from the critic 3.5 out of 5 stars.
Once the album was released to the public, it entered into the Billboard 200 chart, debuting at number 26, selling a rounded 14,000 copies in its first week of release. On June 22, 2016, the album was certified gold by the Recording Industry Association of America (RIAA), for combined album sales, on-demand audio, video streams, track sales equivalent of 500,000.
"Holla Out" features a sample from "Train Sequence" by Geoffrey Sumner. It also features excerpt from an unreleased Skrillex track known as "Tabasco", a demo track known as "Pop Then I Did It" and interpolates "Headlines" by Drake.