Taking house off the market & changing realtors?

I've had my house on the market for about two weeks now and I'm very dissatisfied with the realty company selling it. And it's not because of activity either. I understand the market/economy today. The reasons are too many to list, but the bottom line is this...the company seems to be ok with me taking my house off the market. However, I may be rethinking the situation and selling it myself or going with another realty company. One of the agents is coming to collect the lock box and For Sale sign in a few hours, and to provide me with a form to sign, permitting them to take my house off the internet mls listing. My question is this...is this a standard form used, and is there any time line or clause that generally says one cannot relist a property with someone else, or sell it themselves, within a certain amuont of time? Or is it just cut and dry and releasing me from their mandate? I'm very mistrusting of this form, and the company, and what it may, or may not, say in keeping me connected to them. BTW, the agent never left me a copy of the listing contract when I signed two weeks days ago. Just another reason of why I believe they are not doing things professionally. I live in NJ, if that helps. Thanks to all opinions and advice...