I am happy with this app, because it allows me to view the entire IPA unhindered. It provides a complete list, arranged in traditional order. For a price, it also offers pronunciations, which I deem accurate enough based on my ability to reproduce them. Two things that I would be grateful for are grids for the phonemes, and the ability to copy any given character to my clipboard. Otherwise, this app serves my purposes just fine.
(To the fellow who, for want of a nicer word, complained about the alveolar trill: yes, it is inaccurate as such (as well as [u], and [l]), but English is nearly always represented with /r/. It is meant as reference for looking up IPA representations of that language, which will have /r/, and it would be confusing for the app not to have an English pronunciation for that character, and instead relocate it to the retroflex approximant. Therefore, it is prudent to instead have it at /r/.)