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Hello People. Here is an honest reeviw for those who are looking for a good headset. I purchased the Voyager 510 over two years ago to go with my Katana phone. The problem I was having with the 510 was that the signal would drop a lot, so much that I called Plantronic and they told me that the Katana was not compatible with the 510. However, they're customer service was excellent. They told me that cell phones control headset, headsets don't control phones. Cell phones send out signals and headsets pick up the signal. But to make sure I didn't have a defected headset, they sent me a new 510 hoping that will solve the problem. However it didn't. So I was convinced that it was the headset, not my Katana. My wife and I decided to upgrade our phones, so I purchased the Samsung Instinct and I wanted a Bluetooth headset that would work with my new phone, since I was convinced that the 510 was not a good headset. So I purchased the Plantronic Discovery 925. I really was excited when I received the 925. However, here are my Pros and Cons of the 925: Pros: 1. It looked great and its small size was great compared to my 510. 2. The recharging case was a neat feature. 3. One button controlled everything. Cons: 1. It was the most uncomfortable headset I ever wore; so much that it hurt my ear. 2. The sound was not very loud compared to my 510. 3. The recharging case was very difficult to place the headset in. Summary: I returned the 925. It just caused too much pain to my ear. In the meantime I continued to use my 510, which I notice was working pretty well, no drop calls with my new Instinct. Still not too sure about the 510, I purchased the Jawbone. Once again, I was really excited when I received the Jawbone. However, here are my Pros and Cons of the Jawbone: Pros: 1. It looked great and its small size was great compared to my 510. Cons: 1. It wasn't comfortable to wear. 2. The sound wasn't very loud. 3. The buttons are hard to find and the fit was very hard to achieve. Summary: I read several reeviws and a lot of people recommended getting Jabra mini eargels and it would fit perfect. So I order the eargels. However, I said to myself, why should I pay an extra $10 to get a headset to work correctly. I already spent $90 on the headset. The eargels should have come with the headset. So after I gave it some though, I returned the Jawbone. I wasn't impressed with the Jawbone at all. My 510 worked better than the Jawbone. At this point, I started to believe that it wasn't my 510 at all; it was the Katana, just like Plantronic customer service said, because my 510 is working great. However, since my 510 is over 2 years old, I'll try one last headset and use the 510 as a backup headset. So I purchased the Voyager 520, which was supposed to be an upgrade to the 510. However, here are my Pros and Cons of the 520: Pro: 1. The 520 is the most comfortable headset I ever wore. 2. One button controls everything Cons: 1. You must keep the headset close to the phone. It says you can go 33 feet away from your phone using this headset, but that's not true. It's more like 9 feet and I'm being generous with the 9 feet. With my 510, I can go a long distance and the signal is still strong. 2. Not very loud compared to my 510. 3. There is a lot of static compare to my 510. Summary: Needless to say, I was very disappointed with the 520 and returned it. Conclusion: I must say out of all these headsets, my Plantronic Voyager 510 worked best and out performed all of these for my needs. I'm not saying the rest of these headset are not good headsets. However, for my needs, none of these headset are better than my 510. The 510 has to be one of the best headsets ever made and I would recommend it to anyone. Just make sure your phone is compatible with it. And yes, the 925, Jawbone and 520 all are compatible with my phone, but the 510 still out perform them all.