Then I discovered sucralose/splenda just last year, and was surprised that aside from a distinctive taste that can be identified and being twice as sweet as sugar, it's actually alright. Aspartame to me has this really bitter, tangy taste that I'm not able to ignore. The first swill of a cold aspartame-flavored drink on a hot day is fine for ~0.5 seconds until the flavor kicks in, and then I can't take another sip. Splenda/sucralose works just fine for me in my morning coffee, and if you mix granulated splenda with refined sugar in a 1:1 or 3:1 ratio, you can use it in baked sweets without it imparting too much of its distinctive flavor. (Personally, I find it's a decent low-calorie option for baking apple pies).
I'm also glad to hear they're switching to sucralose because - maybe this is silly - it makes me assume they have reason to believe it's safer.
(Diet Dr Pepper and Diet Canada Dry taste OK, FYI. Not identical, but close enough to the real thing.)