Air management system questions.

[jmedero]

I am shopping for an air management system for my 68 burb. It has been about 9 years since I have bagged anything so here we go. The last system I used was ART ride pro kit. Now there are many diff companies selling kits and many diff prices. Now I know the saying you get what you pay for, nut I am looking for information to make an informed purchase.
ART speaks for itself. Other systems like accuair are very slick but just as expensive as ART. Airbagit.com has an "air engine" for half the price. Has any one checked into this thing? What's the deal? I called them but of course they say it's the bomb. What do you guys think? Any info or comment would be great.
Thanks