I wish they'd fix the unreliable notifications issue I've been having since the redesign was pushed out. The messages arrive to my phone, I even get a badge, but no tile on the lock screen, nor a sound/vibration. But only intermittently; sometimes it does work correctly, making it hard to reproduce and prove. The worst kind of programming bug.
I'm beginning to look very tardy at responding because I glance at the lock screen, no messages, great... unlock phone, 1 message delivered 30 MINUTES AGO. I can't even claim I didn't receive it yet due to the two ticks. It's making me look so bad through no fault of my own.