I'd love to see their market share report lol! Me, i opted for the prothane set. Quality is equal to ES, and i got all new metric 10.9 flange bolts when i worked at fastenal..the employee discount made them super cheap!It looks as though Energy Suspension has the market cornered...I also opted for the Energy Suspension kit...quality made parts.
Between the new body mounts, new a arm bushings(moog), and poly in the rear, my cutlass rides like it's on rails which is what i wanted anyway....i like to be able to "feel" what the suspension is doing so i can react accordingly if need be.