I have used note 3 for about a year now and have not faced a single issue. The phone still does not lags. Yes the battery performance has been degraded after the lollipop update but still it is way better that other android devices and of course iphone. In about a year the phone has only hanged twice and that is when I had many apps opened. The memory usage has been very high and stays at a higher level all the time after the lollipop update and the phone gets heated up really quick, but it does not affect the performance or battery.