Actually, I just noticed something. TSMs suck ass. Even when maxed out, they're still outperformed by Chaos Space Marines, who have access to the Berserk Fury ability, the ability to cloak, and the ability to get most of their damage potential in only 2 upgrades.
The only thing TSMs are good at is using their flamers and their rocket launchers versus vehicles. When it comes to heavy bolters and plasma, they are utterly inferior.