Won't go as far as say outright RK is junk but they're not known in Liberty circles to be a reliable lift if you read some reviews in posts, stickies, here or on LOST. I'm sure they make fine gear for other trucks and jeeps.
Once you buy longer travel rear shocks to go with their kit though you're in the $400 range already and may as well spend a couple extra Franklins and get the ARB Old Man Emu and Bilstein combination and a few extra bits of hardware (front plates and rear isolators) you'll find in the lift sticky and discussions in this forum.
I'm down in your neck of the woods and Dave's a lot (Placid, Tupper, Plattsburg, Saratoga, Watkins Glen - you name it) I found a place south of Adirondack Park in Gloversville area when I was looking for parts to buy next year when I visit family or go camping in NY. (And TireRack installers possibly too hehe - Canadians shop a lot in NY)
http://www.4xheaven.com/index.asp
I was looking for the rest of my limited slip diff setup to go with gears I found - but they are also an authorized ARB shop. Prices online are likely better but if you're set on supporting a NY spot that might be it.
Check the posts here for part numbers and ballpark it to see. Well worth it.
PS - that new Plattsburg International Airport built from the old regional airport and airbase looks really promising - finally a place to drive to close to me for super cheap US flights