Am I just paranoid or are you busting my chops?
Anyway I'm not sure what you mean by class charlie services. Are you refering to class C airspace?
I go IFR regularly. I am talking to someone all the time. However it is still a good idea to stay one step ahead of the controller. Have the ATIS of your destination if posible before center hands you off to approach. The Approach controller may tell you:"Information___ is current, bla, bla, bla" however, more than likely it is an abreviated ATIS. A good pilot knows that the there may be new NOTAMs since he/she departed, or other important information, that the controller omitted. Furthermore some controllers become rather annoyed if you don't pick up the ATIS before you talk to them.
One last thought. If you're sharp, and have the ATIS before you talk to them, and you stay ahead of the game, the controller is more likely to trust you, and give you what you ask for. If you can't keep up, or the controller doesn't trust you, there is a good chance that the controller will be giving you vectors to hector, then ask you if you have a calender handy before they give you the EFC.