Who has tried "TIDAL" vs other streaming applications?

@outlier , I bought an iPad Mini 2 to control my music using Room on Tidal. I read on a support thread in a Room forum that my iPad needs to be 64 gb. Mine is 32. Is this true?

Damn spell check. Meant "Roon".

With my system, I can clearly hear the difference Tidal HiFi vs High, but if someone changes my setting secretly, I have little confidence if I can detect it . lol.

A minority opinion here, I suspect.  You can attribute it to what you will...inadequate gear, the wrong set up, old ears and degraded hearing.  Just spent a good amount of time over several days of a "free" 30 day Tidal HIFI trial A/B-ing tracks (and small sections of the same track) on Tidal vs Spotify Premium.  Took pains to get volume levels the same (RadioShack SPL meter). Listened on the main system with Gungnir DAC (not Albert Porter's but good enough to hear cable changes and differences in various issues of an album) as well as headphones (Senn 600/AQ Dragonfly/Asgard 2 amp).  Based on enthusiasm from the Tidal fans here and elsewhere in A'gon, was expecting a night and day difference.  Personally, I was underwhelmed.  I thought I might have heard a tiny, tiny bit more hi end, separation, and density to the music but emphasis on tiny.  Switching back to the same track or section on Spotify Premium and that "remembered improvement" evaporated in a second.  It wasn't like the sound stage shrank or high end started sounding rolled off accompanying a noticeable degradation in SQ..  I doubt I could pick out Tidal vs Spotify in a blind test.  So FWIW, that's my story.  Was really hoping Tidal would bring a step up change in sonics but it didn't for me.  Cancelled the trial.  Saved myself $20/month and kept Spotify which I find very satisfying.  Happy listening to you in which ever format you choose.  

Ghosthouse - you were unable to hear the difference between spotify premium, at 320 kps, vs Tidal, at 14,400 kps?  I hope you had Tidal set for hifi.