The Rough Country add is a LIE! the .75" rear spacer has been replaced with a 1.75" rear spacer, and their 2.5" front achieves 2" of lift at most, so basically this whole kit is a useless bunch of garbage if you're looking to level your truck (and a waste of money). Then when you call and complain that they didn't send you the correct size spacer that they advertised, they basically tell you tough **** until you harass the hell out of them for days and end up looking like the bad guy. I personally will never buy anything from RCX again.
That being said, the quality of the front steel spacers is generally the same across the board. Another option that you should consider would be the bilstein adjustable shocks. Alot of people buy the spacers then wish they had have went with the bilsteins.