I’ve used Ace Reader for a while. I don’t know if it is “amazing” enough, but it is good enough.
The problem is that the texts increase in complexity by becoming unrealistic: names, dates, and lists of facts abound in the texts giving them an unrealistic air. They allow a good level of objectivity in the evaluation questions, but they look quite artificial after a time. I think it is good enough to begin a regime of practice, but you’ll eventually have to go for real books and put in some real effort.
By far, I’d say that reading and taking your time to practice each chapter of “Break-through Rapid Reading” is the best option for improving the speed of reading. No magic there, but a lot of useful information and practice suggestions.