Generally this app is ok but it often takes a long time and a lot of fiddling to connect to my receiver (DN1050). Makes it not very valuable as a remote because if it takes 5 minutes to change the volume, that just doesnt cut it.
Also for some reason you cant control the "speaker" button remotely with this app. You can do all sorts of other more complicated stuff but the simple "speaker" button is missing.
So its OK but not great.
Update:
Changed review to two stars because it just doesnt connect well. Makes it pretty useless as a remote. Knowing this prior to my purchase may have made me select a different receiver as iPhone control was a major buying factor.
Sony - get it together. It isnt that hard.
Insectile about Sony | Music Center, v2.1.1