One of the main issues (except the samba 1 only support), is the difficulty to fine adjust the volume in the S2 app, sure you have the lever to pull, but it’s a lot of work to adjust one step. It had been nice is there had been a a-] and d+] in the S2 app to adjust the volume one step up or down.
Another thing I have an issue with regarding the volume, it seems like there are volume levels that are like mute, I have to pull up my volume to 5 before the speaker makes any sound at all and I can tell it’s not the most quiet volume on my Play:1’s, bit too loud for falling asleep to and I have disabled the loudness for the speaker pair (feels like when in pair the volume is a lot louder than if separated). Maybe this is a hardware issue and not a software issue, but I hope it’s the later for then it would be possible to fix it.