I have heard plenty of online reviews that the JBL Flip is having issues with the Bluetooth signal (weak signal, signal cutting out, etc) I have written Harman/JBL regarding this issue and they have replied that they are aware of the problem and have recently redesigned the BT antenna. They provided me s serial number cutoff of GG0054-189100.
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All units above this number will have the new modified JBL Flip with the new antenna. They are pulling out all 'old' units from retail stores and replacing them with the 'new' JBL Flips with the improved antenna that is supposed to have taken care of the BT signal issues of the old units.
The serial number for your order ships, amazon will scan the jbl amplifiers are you looking for your order. Some of the speaker cables. Buy jbl professional. Talk to a product expert. Call us now at: (800) 336-4525. Mon - Fri: 9:00 a.m. (ET) Sat - Sun: 9:00 a.m. Our phone support is.
JBL will be rolling out the new units in a few weeks (early March 2013) so please check the serial numbers before you purchase to ensure that you get one with the better BT antenna. Just sharing.
UPDATE.The new units will be out mid March as per Harman/JBL advise and will should have serial numbers above 0189100. I've had this product for 2 weeks.
I did a bit of research before deciding to go with the hype of the JBL brand, and though I am not disappointed, I feel I could have made a better choice. Here are some pro's and con's after the first weeks. I've had this product for 2 weeks. I did a bit of research before deciding to go with the hype of the JBL brand, and though I am not disappointed, I feel I could have made a better choice. Here are some pro's and con's after the first weeks. I have heard plenty of online reviews that the JBL Flip is having issues with the Bluetooth signal (weak signal, signal cutting out, etc) I have written Harman/JBL regarding this issue and they have replied that they are aware of the problem and have recently redesigned the BT antenna. They provided me s serial number cutoff of GG0054-189100.
All units above this number will have the new modified JBL Flip with the new antenna. They are pulling out all 'old' units from retail stores and replacing them with the 'new' JBL Flips with the improved antenna that is supposed to have taken care of the BT signal issues of the old units. JBL will be rolling out the new units in a few weeks (early March 2013) so please check the serial numbers before you purchase to ensure that you get one with the better BT antenna.
Just sharing. UPDATE.The new units will be out mid March as per Harman/JBL advise and will should have serial numbers above 0189100. 
I have researched a lot on the wireless speaker: logitech, creative D100/200, jawborne, HMDX, etc. After price vs.
Performance vs. Reliability trade-off, I finally made my decision to go with JBL. After a few weeks of usage, including a 5 hr. Trip with kids in the car, I think I made a right choice. Functions: it satisfies my need, simple bluetooth connection to my laptop (thinkpad x220), i-pad, a-pad, nokia smartphone, i-phone, HTC phone, etc, the bluetooth is fairly simple if you know what you are doing; the speaker/microphone is ok for conference call in quiet environment, this is a function I must have additional to listen to music A few people had issues with BT connection with laptop, I had same issues but I finally figured out it's because of BT setting in the computer (Turn off Save Power for BT), the drop off issues could be fixed. Of course I did pay attention to some of the early review, the SN number must be larger than 18900 because the new design occurred after that.
At my hand, I don't notice any significant bluetooth drop off issues, tried a lot of devices only happened to my laptop but it's laptop setting issues. However I-phone music playing had some momentary glitches, but not noticeable. Performance/Volume: it can be very loud!!!