We've done SEM and RSM, and I wish I had found a review like this without having to try both, so…read moredecided to write it. Classes wise, Studio for the win hands down. Our kids really enjoyed the classes, the small size (up to 6 kids, sometimes 7), the teachers, and the materials. Lots of variety, interesting problems alongside more basic ones, more levels, and the kids clearly learned a lot. RSM classes are larger (10-12 kids), only 2 levels (plus a 3rd which they designate for "math addicts only" - the kids who crave more math), and apparently good, but not as "fun". The kids are clearly still learning, but it feels more like a chore. So, for classes, SEM is the clear winner IMO. For homework, the story is completely reversed. SEM homework consisted of 15-20 pages, so even if some pages were really short, the sheer volume was overwhelming for the kids. The pages were often bad quality photocopies, and often very repetitive week to week (same style puzzle for weeks on end for instance). The homework battles were endless, and at some point the kids simply refused to do them. It was nice to get interesting questions, but when it's essentially the same interesting question over and over and over again week after week after week, it's no longer interesting (e.g. find the differences between pictures, circle, count... Or solve an identical logical puzzle with 30 variations, week after week). We also didn't feel the kids were learning that much from the homework - some things were too easy, others just repetitive, and overall is just felt like too much. Then, they were expected to correct all the mistakes from the prior homework before getting their "reward" (stickers towards prizes), so unfinished homeworks just piled up one on top of the other, becoming even more overwhelming, and even less rewarding. There was no "partial" option - they got a reward only for perfect, completed, corrected, homework. RSM, on the other hand, is GREAT for homework. 3-4 pages, so not overwhelming in volume. All pages are printed fresh, not bad quality photocopies. They expect the homework should take 30-60 minutes (vs 60-120 min in SEM, usually took us 75-90min). It's been taking 25-40min tops, to do in full. The parents are encouraged to NOT do it with the kids, so the teacher can evaluate what the kids did on their own. This is helpful, and we've had no qualms about our child doing the homework only partially sometimes. From 4th grade on, you enter the answers online, and the kids see immediately if they were right or wrong, and get scores and badges/"medals" online. The questions kids did not do correctly get dealt with in class, and are not carried over to the following week. If the kid didn't do the HW in full, they didn't. No big deal. As long as they don't fall behind in class, no one makes a big deal of it. (In SEM it felt like we were constantly talking to the teachers about incomplete HW). So, homework wise, RSM is the clear winner. If SEM put together a better homework policy/system, we'd go back in a heartbeat. But the homework in SEM introduced so much stress, to the kids and to us the parents, that we decided we can't deal with it. For kids who are already stretched to the max with extended days and other activities, and parents who are working full time and don't get a lot of quality time with the kids, and would rather spend quality time with their kids when they do have the time, and not spend it on homework battles, RSM is a much better fit. So, for now, we've moved to RSM. And I say that sadly, because I do think the classes and also materials in SEM are better. They really taught math through games and tangibles whenever possible. Overall, SEM is like an exciting startup with many kinks still remaining, RSM is like a well oiled machine that moves forward with much experience and relatively little innovation. Both have merits. Hopefully this review helps others trying to decide between the two options. It's a tough call. I really wish there was something out there that "married" the best of both.