For starters, I haven’t had the opportunity to have had such a great experience with Mophie. On my current second device from Mophie, the device is iffy at best. Let me explain.

When I first received the Mophie device (and to make a long story short), the battery was diagnosed to not have the capability to hold a charge. In addition, the sync/charge cable was defective in that although it would charge the Juice Air, it would not charge my iPhone in conjuction to when it’s connected together.

On the second device that was sent, the sync/cable again was DEFECTIVE. Although this time around, the juice air is performing as it should (based on the tests I have done) but the capability to hold the charge is very sporatic. There are days where I would only get 3 to 4 hours worth of charge from it before it is depleted, mind you, it is coming out of a full recharge and first use from standby, then there are days where when it did work, I would be able to charge my iPhone from let’s say 30% to 85% and when it goes down to 45% or so, I would charge again to 85% and from there the battery is done for….

From this deduction, I would say that the Juice Air can charge your iPhone a good one full cycle. Of course, I could also have a defective device but at this point in time, after dealing with their customer service time and time again to get it right, I am already at my wits end.

Regarding loss of signal strength. Yes, Mophie will dampen your signal strength. Testing this as well, I was able to prove that. I actually have a video of my iPhone with and without the Mophie Juice and you can literally see it go up and/or down depending on whether you have the case or not. This was tested in a control environment. I literally lost two to three bars.

To sum it up, I wish I had your experience with Mophie, however, I can’t agree especially to the experience I had gone through with this device.

Other than that, tread with caution.