I have a Myo as well, and it's pretty disappointing. The gestures are so rarely recognized correctly for me (maybe 20% of the time for the fist, pinky to thumb

I have a Myo as well, and it's pretty disappointing. The gestures are so rarely recognized correctly for me (maybe 20% of the time for the fist, pinky to thumb and open palm) that it's always easier to do the action another way. Other people have much better luck, so it may just be limitations in their training data (also, there's no way to train the classifier for your particular body, so you're currently stuck with averages). But the real disappointment is that there's no access in the SDK to the raw EMG data. This means that as a developer, you only have access to the (in my case useless) gestures and the accelerometer data, which can be captured by much smaller and cheaper devices. I'm hoping that Myo will open up their data sources, or at least improve gesture recognition. Right now it's pretty useless as a developer device.