I am pretty sure I have one of these and it works fine. The big downside is there were only 3 ports that would turn off, and with one of the ports being filled with a transformer for my speaker, it took up two slots of space. I pretty much could only plug in two slave devices without an additional AC splitter.
Another problem with it was that I did have an old computer I originally used it with that was drawing too much power while the computer was off, and the power strip slave ports just stayed on all the time. I swapped in a newer PSU and it worked fine after that. That is an issue with smart strips that don't have a tuning dial. The reverse could happen as well where a micro pc that doesn't use much power will not ever use enough juice to trigger the slave ports.