PepsiONE has always been my favorite diet cola because it had the BITE of the OLD coke. It has used aspartame (Nutrasweet) and acesulfame-K for sweetning.
I happened to notice that they just switched sweetners to SPLENDA and acesulfame.
So for those who prefer sucralose (Splenda) to aspartame (Nutrasweet) you might be pleased...the acesulfame remains the same.

I think it's a little duller but many people don't like that BITE, it's gone now!