Great wheels. Super light and very aero, for my money the paired/low-count design is incredibly fast. Larger, more powerful riders will be able to flex them quite a bit.
The one knock is front hub durabiity. Expect to replace the front bearings at least once a year. They go quick, but that's also what helps make them so light.
If buying new, I would pick the 58s. Stiffer, more aero, not much heavier. But neither are going to slow you down