Ive searched around a bit about those servos. About the whole Lynxmotion community shouts "Stay away from Tower Pro servos!". Many people have had bad experiences with those servos. For example they received some dead servos, some died after a few minutes, they were all twitchy and stuff like that.
I think there is a reason Hitech servos cost a little more.
I'll go with the Hitech HS-475HB servos, they meet my needs, are reasonably cheap (17.99 isn't so much actually), and can be trusted (according to what i have heard). Lynxmotion uses them pretty widely.