I have tried the iFi, a Lumin and a Wiim; I really like the interface of the Wiim and with my external DAC’s I have not noticed a difference from the Lumin.
The iFi was adequate but the app was intermitent.
The Lumin did not provide native Amazon HD which, along with Qobuz, are my sources.
I'm waiting on an Innuos Zen 3 now.