i have the Agent and I am very happy with it. About the flex it really depends to what you are comparing it to. I think is nice and has a lot of flex, but other people like park riders would say it does not have enough flex. If your are looking for something with more flex look at the Graft, but I am not sure about the how wide it is.
Funny thing, I used to also say that my old board was like cement. I am sure if you come from a really stiff board, you will love the slash.