I have had the note 4 since January. The speaker for music and speaker calls is def louder than the note3, but as far as music it doeant compare to say the htc phones because thats a selling point for them. It is enough for me when im listening to music getting ready for work or something like that, other times i use a bluetooth speaker.
I dont see much lag with the note4. I will say im not super picky on what some people call lag. If something takes half a se ond to open for the first time it doesnt bother me. As far as scrolling screen to screen and things like that i dont think the note4 has noticable lag, but then like i said, im not super picky.
The note4 is a solid phone and still second to none in my book, if you like the size of it and you like having a battery last all day its great.
Good luck, but after a few months with mine ( ive had the note 2 and 3, and the last few droids that have been out) i wouldnt trade it on anything that is currently on the market. The galaxy s6 was a great concept until samsung skimped on the battery for the "thin is in" crap.
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