I opened the 37 sensor kit from Sainsmart. This is definitely a nice kit over all. No difference than the Robotlinking kit that I opened earlier when it comes to the sensors. I felt that the main difference is the final fit and finish of the package. Robotlinking comes with a diagram that really helps us beginners know what sensor is what. Of course Robotlinking also came with the cd that has all the files on it. I like it but also realize that most computers don’t have drive in them anymore. Robotlinking also give a free item with their purchase which is nice. But the kit is fine and would not have an issue recommending purchasing it.