Just got mine; ordered directly from their site on Saturday, received it today... $39.99, free shipping, no tax.
I was using a Logitech unit previously, and while it sounded fine, it had the disadvantage of not being very good at automatically reconnecting to the phone, and of course it had no hands free capabilities. As with pretty much all bluetooth units, there are a ton of reviews on the Kinivo; both good and terrible, so I thought I would offer this up strictly within the context of the Moto X.
Short story... I am thrilled with it!
Amazing connectivity. It reconnects under every condition possible; moving out of range and then back in range, power off and then on, Bluetooth off and then on. My vehicle's power ports are always hot, except when cranking. This gave the Logitech fits, and I was concerned about the Kinivo as well. Bottom line... if bluetooth on the phone is on, it is always connected!
Reasonable audio quality, and contrary to a number of online reviews, both in call and media volume are good. See my cons below for more on audio.
Very positive buttons. While the thing looks a little cheap, it feels surprisingly good.
While not as good as a quality headset, I thought the in call quality was pretty good. Tried it in town on some bumpy roads, as well as on the freeway and intelligibility was good. I mounted it on the side of my center console so I can access it with my thumb when my arm is on the armrest.
Interoperability with voice commands works very well. Long press the main button and speak after the prompt. Bingo!
In my Ford truck with Eclipse head unit, it requires a ground loop isolater, as has been the case with any 12v powered device in this vehicle. However this IS a 5v device. I suppose I could've cut the 12v adapter off and power it from my daqstuff isolated 5v supply to eliminate the need for the isolation transformer, but didn't want to mangle it before checking out how well it worked. Obviously, the audio will be much better without the transformer, but it is still bluetooth, and I primarily listen to podcasts while driving. Plus, all the music on my phone is from Google Play Music, which is notoriously poor quality anyway. I doubt I will be rewiring this to the 5v supply as I am happy enough with it as is. I can always pop in a CD when I really care about audio fidelity.
While in call quality seems completely acceptable to me (it sounds easily as good as my brother's fairly recent Sony unit), if you're doing business while driving, and expect it to sound like your not, this is not for you.
While voice commands work perfectly, the initial prompt to say a command is very low in volume; like 10db lower than anything else. The rest of the prompts / confirmations / responses are fine, so this is a mystery I have yet to figure out.
Wires are thin. While I suppose this makes it easy to route them, they will not stand up to a lot of stress. The interior of my truck is dark gray, and I felt it prudent to use some black gaffer's tap to secure all dangling wires to surfaces.
Bottom line... How well this works, and being able to locate this little button practically anywhere, makes this thing insanely convenient.