You seem to be comparing the standard 3-section with the Long 4-section -- could this account for any of the weight and price difference?
I have the 3530 LSV. This is the tall 3-section version. With a RRS BH-55 mounted, the camera viewfinder is at eye level without a center post. I chose the 3-section for greater strength and rigidity, and slightly faster setup. The 4-section may be slightly taller, and fits in carry on baggage, which may appeal to you.
Depending on your height, you may wish to compare the Long versions of both 'pods.
My tripod is a couple of years old and holding up very well.