I absolutely love my Nostromo Gaming pad. Its sooo awesome for MMOs and FPS. The thumb joystick isnt really great for movement in FPS, I dont think they meant for it to work like that anyways, youll still use the WASD combo up top and the trigger for jump. I find its best use in EVE, when I have to hold a button down and then click with mouse. The diagonals are tricky, think of it like the old NES pad, not an analog stick. But it does have an awesome button for Teamspeak/Vent which youll find extremely useful. If your on the fence, get it.
I love the Naga Epic mouse as a mouse, but the side keypad buttons are very hard to push without moving the mouse to the side. I havent been able to use those mouse buttons for action type stuff because youll move your mouse when your trying to click precisely on something. I've heard healers use it in WOW because they dont have to click on anything, they can just bind heals to party members for each button. Your thumb will get lost in the buttons to, I have to look at the mouse when I don't press 1-3 or 5.