MPX06-3 Micro Motor Driver Module - Silver (DC 1~6V / Size M / 10 PCS)

Pros: Works as intended. Can even be used to generate power if you rotate it.

Cons: Connectors for the positive and negative feel like they could break if you bend them to much. Didn't notice any labels indicating which one is positive or negative. Don't have much torque to them, but I wouldnt expect them too.

Other: If you need some motors for some small cheap projects grab these.

Pros: Cheap and fast motors. Works as expected. One tested for spin gave more than 33000 RPM at 6V and more than 52000 RPM at 12V.

Cons: The drained current is bigger than specified. For 2V about 0,3A, for 6V about 0,5A and for 12V more than 1A. Half of them vibrate even at low voltage showing a imperfect brush contact or unbalanced rotor.

Other: As they are cheap I feel no sorry of them on the experiments. The projected ones for 12V spin 18000 to 21000 RPM, so one can just pull controller half way to not burn them, having same spin.