I just got the SW2 today and installed this extension on my Z1 Compact. I can see the app in the settings/apps on the watch, but there's no icon for it. If I open the sony camera or google camera on the handset, the advanced settings within the watch's settings/apps/camera smart extension tries to do something on the phone, and the phone flashes a message about no settings, but I can't work out how I'm supposed to take pictures.
EDIT: OK after 3 uninstalls and reinstalls (even giving it a few minutes to copy the files over bluetooth) the icon has appeared, but the app is so buggy and only shows a preview image 1 in 5 times. Pretty much useless it would seem.
Sony Xperia Z1 Compact, Asus T100, iPad mini, MacBook Pro retina 13"