I am using Teresa with vacations4less and signed my contract wtih her back in February of 2012. I think she's fantastic and I have no regrest with my decision to use her. Also, I still have the best rates since signing my contract in February
Since you have already chosen Now Jade, keep in mind that no matter who you choose as a TA there will be limitations to the number of free rooms you will recieve as set by AM reosrts (I assume you'er referring to the book 5 get the 6 free). From my previous conversations with Teresa, if a lower rate is published at any point I can have my group rate adjusted and if there is a promo of some sort of another website, more than likely she can price match. With that said it would be your responisibliyt to periodically check and make the request.
My best adivice is just to ask any and every question that comes to mind. Teresa is a great resource and I have honestly ome to trust her.
Good luck, let me know if you have any other questions.