I like the buzzermanager tools, but I find myself in disagreement with the lineup simulator sometimes. For instance, it wants to put my PG at SF. Yes, he's better than my SF, but he's also my best PG.
Also, it never wants me to use my starting SG but to play my backup instead. I think it's because the backup has some better inside skills, but I like him as a 6th man to backup both guards, while my starter is capable of doing some valuable scoring.
Anyway, tools are useful, but it's also fun for me to run my team the way I want.