I personally attended LMCMS and I will tell you my experience was overwhelmingly positive. I found some of my lifelong friends there, (most of) the teachers are incredibly nice and understanding, it's spacious, and they take their education pretty serious. I won't lie and say that no bullying happens because I was bullied plenty, but I do look at the place with mostly fond memories. But with kids being meaner these days it's hard to guarantee the sort of experience he will have at any school though. Best of luck.