Very fast, I have managed to reach speeds of 900Mb/s and 1GBp/s (only with the TypeC Interface). I have installed Windows 11 and it works without any problem. The only negative is that it heats up excessively to the point where you can't easily hold it. The caps are a problem that you can easily lose.

Bought the 512gb version. Quite fast in writing when transferring files from an SSD to the stick (80gb file with speeds of 515-550 mb/s), from a conventional hard drive to the stick (around 120 mb consistently), and in both cases connected to a USB 3.1 gen2 10gbps port. It gets quite warm during file transfers. It has minimal lag during idle or when playing on the TV. Only time will tell its durability.