My initial thoughts were that Amazon might be trying to go after Apple like they have done in the movie market (i.e. Netflix) - maybe go after the audiophile market as a longer-term objective.  For me Roon integration would be essential.
Yes it must offer Roon integration! I use both Qobuz and Tidal. Both services sound different from each other in Roon. Thus far I like Qobuz a little more. It is less aggressive and more relaxed sounding..,warmer.  Others will like Tidal more as this is subjective and system dependent. Comparing the exact same 16/44 recording on both services reveals a sonic difference.  Seems these services have a “sound” beyond the numbers. 
Amazon wants $9.99 from me for a trial. $14.99 after that.
That’s because I did a free trial of the old service. Then cancelled it.
Makes me wonder if I log in on my Node2i, will I get HD?
Of course I'd have to resubscribe
I’m not a prime member