See my comments elsewhere in Avforms on 10 reasons not to buy the current generation of Samsung Galaxies.
In essence, the Touchwiz UI has been stripped of many useful features and other important stuff, like audio over headphones, is poorly implemented.
Samsung Galaxy Note 4 User Review
Great hardware but rubbish softwareReview of Samsung Galaxy Note 4 tablet by edward, May 5, 2015.This item was purchased for On contract from Vodafone in 2014. The reviewer still owns this product.
Value For Money5