We have sold a few of the hcr kits (another one this morning, actually), and have yet to have 1 complaint or a squabble with any of the customers. The few kits we have talked to customer after the fact said they loved their kit (hcr) and are very impressed with it. We have been dealing with damon and hcr for a long time and they are a very reputable company and stand behind their product. Ive never seen the diecast kit nor do i know anything about it.
The hcr kit is a 6" over kit, comes with king shocks, axles, hardware etc for $5250. The hcr kit is around 15-16" of wheel travel as well.