THE BEST till ipad 4 series. it never gets hang hardly crashes. I have been using it for 2.5 years and I loved it, in fact I am not willing to buy ipad pro because I am able to do all my work on ipad 4 without any issue. the problem with samsung product is that it hangs very quickly.
I am using tab 3 for years but it cannot match ipad 4 whatsoever. the problem with ipad air is that it gets heated up very quickly while charging due to probably its decreased thickness but ipad 4 dont have this issue. will deifinitely recommend it anyone planning to ipad with low budget as ipad 4 is cheaper after the launch of ipad air and pro.