i experimented with long travel ifs for a while on my 87 runner, it was fun but heres how it breaks down=
lots of money...lots
if you break it, lots more money
it will never have as much travel as a well built sas
it is weaker, 21 pivot point compared to 6 or 8
less gear and locker options
mine was ok,i had a mixtutre of t100 parts and total chaos parts, but my sas design rides better on the street, flexes like mad, is about a billion times stronger, and safer.
and can still handle some off road speed.
like previously mentioned, it just depends on your preferance, but in the long run, no one can dent that sas is cheaper, stronger, and makes for a better all around off road vehicle