just a little advice.....
i bought that exact same tripod about 5 months ago, and just had to get another one (different one). one of the quick release plates cracked about 3 weeks after i got it with only my Rebel XT and Sigma 70-300mm lens on it, the hook broke off when i put my camera bag with 1 lens in it on it, the gear to raise the center column started to stick and oiling it didnt help (it got stripped), and finally one of the legs broke at the top. i take very good care of the stuff i buy because i cant afford to replace them, so it wasnt abused at all. it just wasnt a very good tripod.
i hope you have much better luck with yours, but i would keep an eye on it, just in case.