In 2015 Diet Pepsi switched to using sucralose as their sweetener.
And I thought it did not taste good, well now they have brought back Diet Pepsi with aspartame permanently (it was out in limited form since late 2016 in the light blue bottle).
And having it, does taste much better again and now the label says Classic Diet Pepsi Taste underneath.
(https://i.imgur.com/f24lMjI.png)
New bottle is on the left. Wish they would freshen up their labels with a new look (Bring back the classic pepsi globe!)