Worth thinking about what they would bring to your game. If you play in a group then can you rely on them to maximise the opportunity your TAG rounds would offer, then worth it. But if your a lone wolf (like me) and people normally look at the smoke screen you just put down, shrug and go in a different direction (totally frustrating) then maybe not so useful
If you like to be at the front charging in or sneaky then maybe they wouldnt suit your play style either...