The n52 feels like a regular keyboard. However it takes work to adapt it to your games. The work pays off. With the 3 different modes the n52te allows you to access 30 keys without moving your hand. I've used it successfully in WoW, UT III and Dead Space.
I have the g15 and my problem with it was having to learn the key positions on top of their assignments. The others in the list feel so unnatural.