Android 5.1.1 on S5 Mini. Will I have no problems with it after installing it?

[AC Question]

So, Lollipop is available on SM-G800F in the nordic countries (I live in Sweden) since approx. 1 month back. Are there any bugs/glitches in 5.1.1? Will my phone work as it does now after I install 5.1.1 (have not installed it yet, that's why I'm asking)? Anyone that owns a S5 Mini (SM-G800F or any other of the S5 Mini's) with 5.1.1 installed on it? If so, what are your experiences with it? I'd like to know as much as possible before installing, in case there could be problems (battery, slow, etc.). Thanks in advance