Summary: We have cs55 as well, these seem like a much better option as far as range is concerned.
Pros: Very Comfortable, Easy to hear. Multiple ear pieces of 2 different styles.
Cons: Range doesn't Hold up to the manufacturer's specs, they claim 300ft, when its really about 30 to 35 ft. I work in a Company office and got 6 of these for customer service. I feel like I wasted the money because of the low range these offer. We can hear the customer, but they won't hear me clearly.