I bought their wireless MIDI dongles that I believe were released in 2019. They work, but one side (the receiver I think) requires USB power, which adds bulk and complexity if you're trying to use it in a truly wireless way. Since I was already using a power bank to power the MIDI module that they were plugged into, in my case a USB connection was available. But to some that could be a deal-breaker. Especially because a lot of those USB power banks shut down if the current draw isn't above a certain threshold! I didn't notice any latency on the MIDI side, but my controller was only transmitting the most basic note on and note off messages. FWIW.