I had a really good experience with Energy. I went to the big 4wpw truck show, and talked to the rep about a full body bushing kit for my '73 K5. He pulled outtheir catalog and circled a p/n. So I went to the counter, showed the dude the circled p/n and paid up. A few days later, I got my body mounts, buttheyt were for the later year blazer. I looked at the catalog and the guy had circled the wrong p/n. I hadn't bothered to check before ordering. The difference between the two kits is only 2 bushings, the ones for '73 are taller than the later years. So I needed to swap these two for the taller two. I asked if I could swap individual bushings in the kit. I immediately got an apologetic email. Two days later, I get the missing bushings in the mail. But, they were the wrong ones again. I emailed again, and the rep from the show called me, was extremely apologetic, and had the correct ones overnited, with a whole crapload of stickers, an Energy banner, and a nice ball cap. I wasn't in any hurry to put them in, so the time lag, although only a few days, didn't bother me any. But the customer service and communication was excellent.
BTW, I replaced the engine mounts in my '73 with the poly inserts from Energy. They went right into the stock clamshells, no problem.