I have been using the JF3 for about 1 year and love them. I have been waiting for Jaybird to come out with an improved model. I was hopng for something with better battery, better sound and aptx. When I saw the JF4 I thought I better try them. I bought them at bestbuy about a month ago. Well after using them for 1 week and comparing the sound to the JF3 I returned them. Here is a comparison between the 2 which should help anyone who is looking to buy these or upgrade to these. I will start with what is better about these. They are smaller while nice really not a huge difference and you dont notice it while wearing them. Both are really comfortable. The JF4 ended at the bottom of my ear while the JF3 extended about half an inch. They now have a micro usb slot to charge the JF4. The power button/play stop/ answer call button on the side has been moved to the top and is much easier to press. That was probably the improvement I liked most. Thats where the positives end. Now for the negatives. I was surprised that they would not include Aptx on the JF4. To me the sound was actually slightly better n the JF3. That may have been beause thet are louder but they seemed to have more bass. The button on the side to change the volume and to go forward or back are much better on the JF3. They are much easier to press. The JF4 button are harder to find and do not stick out enough. They are also closer together. The battery life to me was too short on the JF3. I get around 5 hours. I was hoping for more but with the JF4 you get around 4 hours. The status light has been moved to the inside on the JF4 which would seem like a good idea as many people do not like to have a flashing light that others can see. Well the problem is the place they put it inside. It is blocked by the ear fin. If it was in another position it would be be better than the JF3 but not where it is.Since I think the JF3 is better I dont see how they are charging a 30% premium for an inferior product. Both sadly only give you around a 3 minute warning when the battery is low. Thats pretty useless,it should be at least 15 or 20 minutes. So to sum up if you are looking to buy these I would buy the JF3 instead. If you are thinking about upgrading your JF3 to the JF4 save your money. I hope they do come out with a JF5 that will have Aptx, improved battery life and a longer battery warning time and with the power button on top. If that came out I would buy them. I wear my JF3 looped on my ears which prevent cable from rubbing on your neck. I wore both this way. I would have given these 3.5 stars but that is not an option.
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