The only thing in the set that is half decent is the Hammer. The rest of it is not worth it at all. If you can find it for really cheap it might be worth it for just the hammer.
I personally think they don't match the aesthetic of city commander, and they kind of feel cheap. But if you don't have launchers and really want them, they are an option. Just don't pay much for the set if you buy it, cos it's really not worth it. BBTS has it for about $30 right now, that's probably the most I'd pay for the set. In fact that IS about what I paid for it.
If you want shoulder launchers for City Commander, your best bet is to try and track down the FansProject add-on kit for the set. I was lucky enough to get one of the later runs which included these anyway. I take it you have one of the original versions?
The shoulder launchers are terrible compared to the official one. The sword's alright The flag's useless. The hammer is really the only thing its got going for it./