This does exactly what it says it does, and is really easy to hook up. There are no instructions with this, but the pictures show you how to attach the board to the teensy. I just went ahead and ordered a second one!
When I first opened the package I found a chip that had bent pins. I was a bit worried, however I quickly fond that all the other chips were in great condition. I have been using them for some hackaday projects and they are performing well and I have not come across a chip that didn't work. Even the chip with bent pins I fixed and I don't even know what chip is was anymore!
Suggestion to the seller though: Include some information in the description on what chips are included. I think that would be nice.
Overall, great experience. Thanks!