I just googled the name. Here's what it says on their own website:
Regarding websites on the Internet that have posted "information" about our agency and myself, Mark Black:
We are aware of such postings which warn against paying any fees for editing or representation of literary material. We can only offer our viewpoint in rebuttal.
We provide a service for writers. Our services are aimed to assist developing and selling writers' material to publishers. We cannot, nor do we, promise to sell any offering, as only a publisher can do so. We can only do our best toward making a success of each work we handle.
We do offer editorial assistance. Any fees are based on the amount of work necessary to make a manuscript publisher-ready. We only offer editing on material that will benefit from such work and is needed before submission to publishers, regardless of who may perform any such revision.
Since all marketing is undertaken on speculation, we do sometimes ask for an advance against potential commissions for unpublished first-time and/or unknown writers to help cover our overhead. If successful in placing a literary property with a royalty-paying publisher, we refund any advance in its entirety and do not ask for any further advances on additional works.
All fees are directly stated for any services offered. There are never any additional fees or hidden costs associated with handling a manuscript.
Spreading dirt and mudslinging are not something we take lightly, especially when the ones doing so are selling their "services" at our expense. We are available to discuss any and all aspects of an author's writing and its potential, not like the faceless, nameless blogs on the Internet. We believe in ourselves and our clients.
I especially like the section in blue. So that means, that if we want to ask them for representation, we may be expected to pay them an advance for their editorial services because of the amount of time they may take up with us to help cover their overhead. A form rejection from a reputable agent sounds better to me.