What are some of the pros and cons of ingesting splenda?

Well people like me can't have Aspratame because of Seizures and Splenda does not have Aspratame. When I was using sugar and didn't know about splenda I gained 25 pounds I had kept off for 10 years!!!! Now I am back to losing weight with splenda. If you do have too much though it will make you go!! I figure it is better than using sugar and safer than Aspratame in Nutrisweet!