I give RC a huge two thumbs up
I bought an older RC 4" lift around 2001, had many years of decent service from it. About 4 mos ago I noticed it had lost about an inch and the RR spring about 2 inches.
So on a whim, I wrote RC (Ryan,, Rough Country on JF I think) and asked about their warranty. The springs have a lifetime warranty, and with no fuss at all and super good customer service, Ryan sent me out a brand new 4' kit. Bushings, the whole works. Had it in four days. I didn't have a receipt due to it being so long ago, they simply looked me up in the system.
The new springs they sent are 10x better than the originals, they flexed like mad on day one and have a much smoother ride. The quality of the kit, right down to the bolts is vastly improved.
Best kit on the market for the price. RC has me as a customer for life now, between the value of the kit, the great customer service and ease of doing business with them.
I highly recommend the product.