The Guild does not offer recommendations on particular agents, but suggests you get references from the agent you are interested in. Membership in the Guild is open to published writers only. If you are interested in joining, contact them for details. An agent has offered to read my book for a fee. No, no, a thousand times no.
Agents make their living selling books.
An agent loved my book, and offered to make it even better for a fee. It's a bad idea for the author. Self-publishing is a tricky business. Ask yourself if you can do as good or better a marketing job before you consider self-publishing or you face a basement full of boxes of unsold books. Bear in mind, too, that most self-published books do not get reviewed.