Okay, I'm a bit hazy on what's going on here, so I'm going to give some general advice that should apply to all agencies and many writers.
First off, you should try to do some research on an agency before you even send a query letter, let alone a submission to them. There are web sites with agent information. There are Internet search engines. There are, of course, forums such as this where one can ask for opinions or previous experiences by other authors. However, without specifying more information about what you're submitting and what you already know about the agency, advice from other authors may not be applicable. For example, if author A sent agent X a fantasy submission, but agent X doesn't handle fantasy, then author A won't have much more to say than agent X's guidelines which both you and author A should have consulted first.
Secondly, if they're asking for nothing more than some chapters or a copy of the manuscript, that's a good thing. Again, the writer should know already whether the agency is any good and whether the agency handles what the writer has to offer.
You should never send out material in blind submissions, meaning you don't know anything about the agency. Why? Because it can be a complete waste of your time, your postage, and their time.