Defective pairing software:beware
580670
Only after one day of use the helicopter would no longer pair up with the controlling device. Both ipad and iphone were used for the purpose and worked on the first day but stopped functioning thereafter. As a result, the helicopter could be no longer be controlled from the iphone/ipad devices and had to be returned.
392585
Fit:
I have a normal size head and the headset feels a bit tight. Hopefully it will loosen up as time goes by.

Design and construction:
Seems solid.

Pairing Process:
It's pretty straight forward as long as you follow the instructions in the user guide.

Pairing with my Galaxy Note 4:
Went smooth. It connected to both phone and media profile.  IMPORTANT- After successful paring, restart your phone and turn off the headset. Then turn on the headset and it should connect to the phone.  Play a song on your phone. You should be able to hear it through the headset. I had to go through this process before I can hear the music in the headset.

Pairing with My Windows 7 (most up to date) laptop:
Laptop recognized the headset but could not find the appropriate driver for it using the installed windows and searching the internet. I have had many BT headsets and none have such issue with my laptop so this is the first. I am very puzzled. I sent an email to Mii support along with the screen shot of the error message and see what their response is!

Muti_point Technology:
Since I can't connect to my laptop, I have not been able to verify this feature.

Battery Life:
TBD

Distance:
Line of sight:  25 feet Non-line of sight: 15 feet for acceptable sound quality.

Sound Quality:
Acceptable! I prefer the Kinivo 240 sound better.

Sweat Proof:
TBD - I have noticed that the charging port in this headset is exposed and there is no cover for it. If you happen to get the sweat or moisture into the charging port, most likely it will cause corrosion and failure unless there is moisture-proof barrier inside. The Kinivo 240 has a protective cover for the charging port.

Updated on 12/17/2014

Inability to pair with Windows 7 with latest update - After spending lots of time trying to explain the problem to Miikey Tech support team which I find to be simply either incompetent or deliberately holding the information, they ACKNOWLEDGED that there is a PROBLEM with updated WINDOWS 7 regarding the driver for this headset. The problem has been KNOWN to Miikey but they simply did not bother to notify the customers. Why, bad publicity stupid! There is NO time frame to fix the problem.

Pairing with Note 4 - As initially reported, I had to restart the Note 4 before the media play back was heard in the headset. Since then I had to do the same twice. I am concluding that the headset is a lemon and IT IS GOING BACK!
2786790
Lets me pair a device but then STOPS WORKING!!! I have tried to update the driver, but then the driver installer says it does NOT find a bluetooth device! I'm glad this didn't cost much as it's going into the TRASH.
1351815
Defective piece, they send me a device which does not work at all. Software defect
400866
I cannot connect my phone and the software is not good, the Bluetooth does not respond and now I'm unable to pair with my phone
4294699
I returned this item after discovering that  Bluetooth pairing had to performed every time the scale was used and that it did not allow more than one device to be paired at the same time.
4775349
I really liked this receiver, but this is the 2nd Yamaha receiver I have owned that has broken itself through firmware updates. Both devices were ultimately bricked through a failed firmware update, which unbelievably there is no way to recover from. Unfortunately I will not purchase anything else from Yamaha - I just have higher expectations on the lifespan of audio equipment.
4092080
For the amount these headphones cost, you'd think they would pair easily with devices.  Well, you'd be wrong.  Ever since purchasing these headphones in April 2016, I've problems pairing them.  Frequently with my phone, a Google Nexus 6, I would have to make the phone forget the headphones and then reconnect.  This worked for a while, until one random day, when it didn't.  After not using them for a couple of weeks, eventually, I could pair with my phone again.

Pairing with my Windows 7 desktop PC is an ongoing nightmare.  With a bluetooth dongle, I can usually pair the headphones, but always get a driver installation error.  Essentially, Windows can't find drivers, and according to Jaybird, they don't exist, either the headphones should work, or it isn't their problem.  I dealt with this for a while, having to make the computer forget and reconnect to the headphones every time I wanted to use them.  Eventually though, my PC stopped recognizing the headphones as headphones, and just sees them as a generic bluetooth peripheral device with no drivers installed.  Now, they don't work at all with my computer.

These headphones have been the biggest waste of money on technology I've spent in a long time.
4421680
insane, won't pair therefore can't use it, very frustrating and disappointing. will be returning as soon as possible. so much for reviews
3325409
Will not pair. This product needs an update that only the manufacturer can do. So whoever buys it will have to send it back to the manufacturerfor the update. Not a way to buy a new product.
1402018
Frustration with bluetooth sync

After first use stop sync, I could receive support from Withings
1746788
Headphones would not keep its pairing with the wifi box. Eventually it totally lost its connection and I had to return it under the warranty to Turtle Beach.

When it did work it was pretty damn excellent. Lots of sound presets and the like, make it easy to find the perfect settings for show or TV.

Overall I would wait until TB fixes the pairing issue before buying this model.
2021309
I got this device 2 days ago. It worked great until today when it installed a new firmware update. After that I can no longer connect with my tablet, pc, or laptop. We have 2 smart phones, both android. Can still connect to one of them but not the other one. What's really annoying is all the devices can connect to the wifi, but when we start the app we get a message saying the camfi is not found in the network. I sent camfi support an email. If they resolve the issue, I'll update this review, otherwise I have to advise anyone not to buy this device.

8/18/2016. Technician from camfi contacted me and wants me to install an app (teamviewer) on my computer and send him the login and password to fix the broken firmware update (he acknowledged that it is broken firmware). I'm not willing to take that type of security risk so the device will be returned. Could have been a nice device to have, but failure to test software before releasing it and then refusing to provide an acceptable fix ruined it for me.

One last word of caution about the support from camfi. The technician that contacted me is using a gmail account. Why wouldn't this person have an email from camfi such as someone@camfi.com rather than someone@gmail.com?  This is very suspicious to me. If you find yourself dealing with camfi's support, I suggest that you be very cautious.
374237
Will not pair with a pixel 2. Multiple people reporting this issue.
3749287
Software looks pretty cool, but when I plugged it in and turned it to on, it wouldn't even connect. If it works, the software looks awesome.
2398709
It works great...IF -- and that is a HUGE if -- you can ever get it to pair. Sometimes, it pairs right away, and works like a charm. Other days, I have spent more than an hour trying to get it to connect to the same pair of headphones that it paired with the last time, to no avail. Today is one such day. Doesn't matter what I do. It refuses to pair with anything. Perhaps the "simplicity of design" should be sacrificed for some sort of way to MAKE the thing pair.
638250
The app has constant problem receiving notes, and require constantly re-pair. Manual sync will wipe the notes in the spark regardless of whether the notes are sent successfully.