I love my Vexplorer! I am in in the process of adding Vex bumper switches and PING sensors to mine. You can see my Vexplorer exploring the Great Northern NH woods in these photos:
I am excited about getting the explorer, i will probably screw around with the normal design and then take it apart but it will provide me with a lot of really cool parts.
For one i get the wireless camera and a 2nd gripper which i can use, but i need more motors and servos now because i have so much stuff and so few motors.
I cannot wait until the adapter comes out so that i can use the vex explorer motors with the vex micro controller. Well there is guy on ebay selling servos for $9.99 each and he has 12 so buy them while you still can.