Do a search on it here, it's been discussed in depth by many quite a bit. The bottom line is that there is NO BOLT-ON LONG ARM KIT that is an any way better than the stock short arm setup. In fact, all of the bolt-on long arm lifts introduce a series of other issues.
You simply can not have a long arm lift in a "bolt-on" package and expect it to perform the way most serious off-roaders would want.