Yes. My co-author and I are with Writer's House, and our experience has been very good. While my background is in law, so that publishing contracts are easy for me to understand, it's important to remember that there's more to it than that.
Quality agents know a great many people in the publishing industry. They cultivate friendships with associate and assistant editors, because those are the acquiring editors of the future. By only repping books that do well on the shelf time and time again, the agent gets a reputation for knowing what the reader will buy. Ultimately, publishing is a business and the publisher expects to make a profit.
Our editor actually told me that when she got a call from our agent saying that our book was perfect for a new imprint they were starting, the editor held open a slot in the line until she could read the book, just in case. The opinion of the agent is just that high. If she was excited, there was a good chance that the editor would be too. That's more than a foot in the door --- that's a doorstop, holding it wide open.
In addition, more experienced agents frequently have negotiated with certain publishing houses so often (since a lot of agents only handle specific genres and the houses that print each genre are limited) that the house actually has a template contract that's different than the one they'd send to someone off the street. A template contract turns the boilerplate that is very "publisher friendly" into a deal that's very close to a level field. Then the agent can step in and make minor tweaks that suit the deal.
In other words, even though I can read a contract, and quite possibly negotiate it, that's not all there is to the agenting business. And, that's why it's so very important that you choose the RIGHT agent. As Uncle Jim has said over and over, a bad agent is worse than no agent at all.
That's what the Bewares section is all about --- finding the RIGHT agent, not just wiping away the slimy deadbeats.
But if this agent has viable sales in the genre you write, then it's worth contacting them. Just be proactive and ask questions. A legitimate agent will be happy to answer them if they're interested in your business. There's a good list over on the AAR website. Since you've already been over there, you've probably seen it.
Good luck!