Wait 'til it goes wrong, Samsung customer service is appalling.
I had the Galaxy S 3 which was a top end phone in its day. They (Samsung) produced a firmware update which ruined the phone. Buggy, poor battery life, dropped calls etc, etc.
Samsung refused to accept responsibility and we're prepared to do very little to rectify the fault. Moreover, there are countless reports of phones being lost, damaged or returned in an even worse state after being sent off to service centre for repair.
I'd have a good read of Samsung Mobile UK Facebook page before you go Samsung. Personally speaking, I'll never buy another Samsung product.
I now have an Xperia Z 2 and it is a magnificent phone.