We switched to SL last year and did core 3/4. Then, we did Core 5 this year. My son loves SL! When we finish a core, he is ready to dive into the next one. We easily finish a core in one school year. We just finished Core 5 a couple of weeks ago, and he's already hounding me about starting back to school! However, he loves to read, which is why it's a great fit for us. The price is high, but it's worth it to me because I don't have to hunt down books or make a schedule. Plus, he rereads the books, and our home library is huge. However, I do not use SL for language arts. I tried that, and after using R&S for so long, there LA program wasn't rigorous enough for us. We did like Science 4, but we really enjoyed Science 5 this year. We are not doing Science 6 next year because we aren't fans of the TOPS books. I do follow the WTM for a lot of things, but I love the ease of SL. With their money back guarantee it's always worth a try!