They were immediately good. I immediately noticed that they have a different USB connector, so other Arduino USB cables will not fit. Also had to download a driver to match usns but that was easy to do. I bought 3. One of the three didn't work. I was able to upload my sketch but couldn't draw power from it. I replaced another one and it worked fine. So I think it wasn't worth buying them to save as 1 out of 3 didn't work.
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