We tried Latina Christiana and my son just could not get into it. We switched at 5th grade to Latin Prep. It is a much meatier course, and some people say 5th grade is to early, but we are just going slowly. We are about at the halfway point now.
The layout and style of Latin Prep appealed to my son. The teacher support was more in Latina Christiana, but all the teacher support in the world did not help when the student just was not into it.
One thing I had to get MY head around with Latin Prep is the way they present the material. Instead of learning 10 words at a time and just working on that vocab, they give passages with a lot of vocab. Some will be the vocab, some is not, and you have never come across it before. You will come across it, but right from the start they want the students to look at Latin as a whole language, not a list of 10 words a week. It amazed me how much ds could just figure out and get the gist of a passage.
The workbook is what you use to test knowledge. Each test is pretty hefty and the first one took 90 minutes for him to complete. I was really bummed when he only got 70%. Then I read ahead in the test book. After chapter 5 (halfway point) is says that by now your student should be getting at least 80%. So, they expect a low score to start. So, for me this was very different.
They have a teacher's key, flashcards, cd of the passages, and a computer game that we are looking at giving a try after we finish chapter 5.
Laura can tell you more if she is lurking around. We are very happy with it (as are a lot of people around here), but it does take a shift for mom to get used to it.