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My wife got the original for me after I made one. It's much better-built, but if I had to pick again I'd go with rings, not the TRX. I can't do muscle-ups on the TRX because the handles don't allow for a false/hook grip.
Mine that I made was a couple of carabiners, some 550 cord, and some straps with handles I found on Amazon for $12 or so. The knots in the cord weren't even, so the handles didn't quite hang evenly, but that wasn't a big deal.