The touch screen is a bit temperamental yes.and being small is a bit fiddly with some apps. It often takes a few presses for it to register I find and it's not always the same so must be related to the load of the CPU or something. It's the one thing that is not great about it. But considering the price you cant expect the best touch screen really. Never had ant hiss with any of my iems or full cans. Battery life of 18hrs is a bit optimistic.
I turned on "show taps" in developer options and it reveals that a fairly precise touch is required on the R5 screen, but I don't think it's glitchy, it just demands either small fingers (it is a pretty small screen after-all) or careful use compared to larger screen devices.
This is true of MY R5 at least, whether it's also true of another would only really be revealed by turning on "show taps". It helps me by making it more obvious when my fat fingers have missed the mark (more frequent than I had imagined).
My R5 has been more sluggish recently, compared to when new, but I don't know why that would be (I only have Spotify on it now, about 4000 offline tracks, and about 30 offline albums as well). I keep hoping for a firmware update to solve this. Spotify has updated several times, but in all honesty, that only seems to have slowed it down so far.
My battery probably would last about 13 hours playing Spotify offline, but that's a guess as I never run it all the way down.
I'm still a big fan of my R5, so far at least.
EDIT:
I removed the transport screen cover, but left the screen protector underneath it in place.