Sometimes they can actually slow the process since they really do feel much like a diaper. Remember that frustration is the key to our learning so don't rob your child of that feeling. Cloth training pants are better. It is really just you and your child who are doing it together, no matter what is the color of the toilet or the music it produces. So it is with training diapers that change colors.
Fancy gadgets can sometimes divert the child from the true meaning of the process.
Remember it is about responsibility, maturity and success, all of which are products of personal work and commitment. You can force your child to stay in bed, but you can't make them fall asleep. You can put your child on the toilet, but you can't make them go. Don't turn toilet training into an issue between you and your child. That would be something that could lead to anxiety for all parties involved.