I can't say anything about the Bog tripod, but as far as aluminum vs. carbon fiber, there is a big difference in weight, carbon fiber is much lighter.
I have been using tripods for 2 seasons now and I will tell you this for what it is worth. Cheap tripods and cheap ballheads are exactly that...Cheap. There is a tremendous difference between a quality USA or Italian made tripod or ballhead and a price point Chinese tripod or ballhead. The rigidity, fluid movement, and stability of a quality setup will outweigh the price difference in the long run. Sure you can buy a $30.00 ballhead and a $50.00 tripod. And then after you repeatedly miss easy shots because it is not rigid enough, or the locking levers strip, or the legs slip, or there is that rough spot in the ballhead that is in exactly the wrong spot, you might rethink going the cheap Chinese junk route.