Chaff Grenades are extremely handy. So are frag ones as an emergency anti-infantry defense, and the plain smoke ones are really handy for when you just need to break LOS for a single turn. VGLs are kinda like missile launchers, in that the sheer number of ammo types available gives you an almost Omni-like flexibility, without having to actually take an OmniMech. I see most OS missile systems the same way, though their greater weight does make them suspect, and I bet I'll never win over the people who hate all OS equipment on general principle.