I love it! It's somewhere between Rod & Staff and Horizons. I found R&S too focused on one thing at a time (facing two whole pages of addition facts is daunting for a first grader). Horizons teacher manual was really, really bad so I didn't consider it. I switched to CLE and LOVE it! The review of the facts is there (some flash card, one minute speed drills) but in smaller chunks with extra math stuff added in (oral problem solving, number dictations, measurement, time, and even a bit of geometry stuff). The teacher manual makes it simple without being scripted!
Amy