I was selected as a product tester for this phone last October and it was amazing for the first three months until about Christmas when it started randomly switching itself off and not staying on once restarted. Did some googling and found there was a known battery issue - they were swelling up and causing phones to turn off at random and the battery to instantly drain so they won't turn back on. Checked my battery and it was indeed swollen.
Phone went back to Samsung who put in a new battery from a different batch, and returned it. But within a week it was switching itself off again and I suspect the swollen battery has somehow damaged the phone. About to ring Samsung to see what if anything they can do next.
Anyway I'd quite like to edit my review to reflect this because it turns out this was a known issue before the product test even started (Samsung had put out a press release about the issue offering replacement batteries for free about a month earlier), the phone is unusable atm because it won't stay on reliably and its really rather irritating! But it seems reviews can't be edited - is there a way round this MNHQ?