Firstly) Yes it is worth it.
Secondly) Pros - looks better unloaded, can fit larger tires, is relatively cheap, is a do-it-yourself project, slightly better command of the road seating, approach angle is better, but pretty much just looks better.
Secondly) Cons - may ride nose high when heavily loaded, may have to adjust headlight aim (I've been flashed only twice in the year since I installed it WITH larger tires), stock shocks may be too short, front driveshaft angle is slightly worse (may wear out u-joints faster if run in 4WD a lot), step in height is higher, axle shifts slightly to driver's side, steering wheel will have to be recentered, caster and toe will have to be reset, ride may be slightly worse (I couldn't tell with tire install at same time - but I am happy), may exaggerate front end wobble.
Lastly) I don't know. Tuff Country is O. K. with mine (slightly less than 2"

) There may be some cheaper kits, but I like the way the Tuff Country bolts in and and holds the spring in place.
Tips - Remove sway bar links to allow for axle to droop and remove springs. If not enough droop to reinstall with spacers, remove upper control arm bolts instead of spring compressor. (Safer and easier IMHO. ) Loosen/retighten all control arm and track bolts on ground after installation to allow for bushings to neutralize. Check brake lines, axle disconnect wires, etc. when at full extension. Align it yourself or take it to a shop immediately. I skipped a lot of steps (like getting a beer, throwing wrench when you scrape knuckles, another beer, etc. ), but just follow instructions.