Wow, I missed the fact Carlton had posted back in this thread a while ago.
What I meant was that I think, if someone is simply looking for increased ride height and a touch more suspension travel, shackles are a better way to go. Yes AAL's add support for the spring pack, but honestly I don't mind the ride my truck has (in the back...the front still sucks.) I wouldn't want to stiffen it up anymore than it already is (w/ shocks on 4.)
The installation is also easier with shackles, and can be removed easier/quicker if someone wishes to ditch them.
Finally, for the time being, shackles are 1/3 the cost of the AAL setup.
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Vikram/gothamist -- MAXC member
http://www.4x4LO.com