If you're looking for engaging stories and sound assessments, DO NOT USE STORYTOWN. None of the stories are engaging, and many of the assessments are awful. One of our tests asked the question, "How could you get a shirt with Froggy on it?" Well, at the beginning of the story is said that Froggy was the school mascot. At the very end, it said if you'd like to join the soccer team, go to a certain teacher and you'd get your shirt for the team. The students were supposed to figure out that if you joined the soccer team, you would get a soccer shirt, and the shirt would have the school mascot on it, which was Froggy.
Just stupid. There are so many times where the students wouldn't know the answers to the test unless they looked in the pictures; i.e., the TEXT doesn't have the answers.
The program IS very teacher friendly, though. That is, if you mean "teacher friendly" as in "completely scripted". It's boring. The students don't like it, and neither do the teachers.
Basically, I can't tell you anything about the other reading series you're asking about, but I can tell you that Storytown is useless.
Hope this helps!

Haha!