Sure I'm glad that TW have finally launched an improved version of the SatNav. Not starting a debate between Android and iOS, it was just a personal opinion. I'm an android fan mainly because of the freedom of system but one should be neutral when it comes to build quality and system stability. Anyways, again just a personal opinion. Whats the fun if after market apps cause problems....... and yes I admit I have a lot of apps and you may be right........ but still. Everyone can have an opinion like one of the members suggesting me to try out Q mobile and compare it with the note 4 
You are right maybe. It is possible that my particular device have some problem. I booked my device with samsung Pakistan before its launch and they gifted me the original S-Cover for it (worth Rs. 8000/- at that time). Really sad if samsung pakistan would give me a faulty device. I guess some apps might have been causing it. Will try to remove some and see.
The aspire navigation screen is a resistive display (not a capacitative) and therefore comes with a mechanical stylus that is why the sluggish typing. They should replace it.