A big part of it is design. The Bogen ones have to be heavy, because they don't have any bracing. .
OMG Are you serious?????? What a gross simplification.... "All Fords suck because they built the Pinto" type of over simplification. I might as well say that all Tripods with those extra bracing are making up for crappy leg joints. Not all Bogens are heavy.. and they certainly don't make them heavy just because. How about stability and durability.
There are designs that are as lightweight and rated for the same max weight capacity that don't have that same bracing. Perhaps the design intention was to eliminate the bracing all together and put the quality into the leg joints. Why??? How about the ability to achieve a 4inch "or less" minimum height position for one...
Not all Bogens are heavy...
Some in the Digi series better quality, same weight, and more max capacity than your beloved Slik.
With that out of the way....
Don't buy a bogen just to get one... Don't buy anything just because. There are many many options out there for a wide range of applications and price. You simply need to go see them in person and decide if it fits your needs. For starters:
* make sure max capacity is enough for your heaviest of equipment.
* With the tripod set and something mounted on it, lightly wiggle the tripod with the center column extended. Does it wiggle even a little? This wiggle will be an issue in even the slightest of windy days.
* Carry it... is it too heavy for your liking?
* Does it extend tall enough WITHOUT extending the center column?
* If you plan on Macro, can it get you low enough and position easy enough?
3 way pan = more accurate fine adjustment
Ball head = quick and fast adjustment.
As with the legs.. the head should also be rated for the proper capacity.
I recommend Velbon for lighter weight.
I recommend bogen/manfrotto brand for everything else.
Do NOT Spend too much. On the other hand.. would you put a $2000 camera/lens on a $30 buck unsturdy tripod?
My Full height heavy duty Bogen was purchased slightly used for $35. Well made.. sturdy.. and nothing really there to break.. so consider used.