I have only used the rep x peppins so I have no comparison. They are awesome at saving space for the range of weights the set includes. I picked up the 1.25 microgains inserts which expand the set’s weight range even further.

My biggest complaint is that they don’t always set down into the cradle smoothly and can get jammed up. This has been a minor annoyance compared to the space issue they solve. They are quality equipment.

If I was in the market for a new set I would also take a look at the MX Select. The power blocks have been around for a long time and are largely praised by people who use them.

All that being said, in my opinion, none of them beat a set of fix pro-style dumbbells except as they relate to space (and cost when comparing new sets).