I've read so many posts about how to copy lift blocks or coil spacers or such; guys asking whats the inside diameter, whats the outside diameter, whats it made of, is this a good substitute. So much trouble to go through for a $100 part. It may be a lot of money for 6 2"x2" chunks of steel, but the question was about whether the RRO product was worth the money, not advice on how to build a lift kit in the shop.
Sometimes its better for a beginner (like me) to learn by installing and fixing rather than trying to re-engineer a product already on the shelf.