Instruct: Classify Amazon reviews into positive or negative sentiment
Query: No no no

Yes, this headset works just fine. No problem there. Good range. Clear calls. But this is a business system, and it's terribly unfriendly for business users.The CS70 battery lasts maybe a year. After that, you cannot replace the battery. You have to send it in to Plantronics, and they send you a replacement headset for $100. Complain and they'll send you to another department where you can get the $50 replacement (refurb!). The Plantronics site makes no mention of the non-replaceable battery, and if you're a small business, this becomes a painful added expense.Instead, get the CS500 series. The headset itself is half the weight, lots more confortable, has a replaceable $10 battery, AND it's the same price as the CS70. My company just dumped a dozen CS70 units and replaced them with the CS540. The sales staff love them, and I love that I'm not having to play games with Plantronics' customer service.