No bad reactions here, but I recently discovered that companies are sneaking sucralose (Splenda) into products that aren't labeled low sugar or sugar free.
I noticed that fake-sweetner whang in Vlasic bread & butter pickles. Sure enough, sucralose is on the ingredients list but nowhere else. The Kroger brand pickles have it too, but not the "old fashioned" style. Since then, I've also seen it in Kroger brand ice cream sandwiches and Thomas English muffins.
I'm that guy standing there reading the fine print on food labels so I can avoid the stuff. I also avoid MSG, because I tend not to be able to stop eating packaged snacks that have it.