Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good, but...

I instruct students in high speed racetrack events and have used the PMC-2 sets for years. With a dozen events a year, and multiple students in each event, these don't last very long without breaking. The unit gets banged up in the students car and typically lasts only a year or so. But the biggest problem is the wires to the headsets at the earpeice. I'll second the earlier review: tell your students not to pull them out by the wire - take off the helmet and let the headset fall out on it's own. Nady needs to make the wires more robust. I go thru about 2 sets of headsets a year due to this issue.There isn't a lot of choice in these units, the PMC-2 is by far the most cost effective solution on the market.Also, sidenote, if you are a student in this type of event and your instructor doesn't have one of these or something similar, you don't have a good instructor. The organizing group should make these a requirement.