Cool concept. but when i plugged my phone into the USB port on this thing while in the car - it made my phone malfunction? the screen started acting strangely. but not when i used a regular car adapter to charge my phone while driving. my friend and i went on a road trip to Ohio from NY and I was hoping to have this help us charge our stuff on the way there but it was weird that it made my phone malfunction.

I liked this product until I realized it will only keep my MacBook Pro powered if the battery is full. If my MacBook needs to charge, the inverter's red light comes on indicating I'm overloading it, and it will not power my MacBook. I should probably have known about this before since I do video edit rendering once a month while driving between locations. I didn't think my MacBook would draw enough power while charging to crash the inverter. For all other things I've used it for, it works just fine.

I've gone through my fair share of power inverters and this is by far the best one I've tried. It does have a few annoying flaws, but overall, this is the power inverter I pack for traveling every time. I'm usually on the road with my job a few days a week, so this gets a pretty regular workout.

Design: The power cup is nice because unlike others that jut out of the 12 volt outlet, this has a short cord that allows you to place the cup in the cupholder for easy access while driving. Depending on your vehicle this may not be long enough, but in most vehicles I've found it works well. For the most part, I use this to charge devices while on the road (and the occasional laptop) and it works quite well for that purpose. I have not tried using other devices that might pull more watts than a laptop, so I can not speak for performance closer to its maximum output.
Unfortunately, because the outlets are placed so close together, it is nearly impossible to plug in two phone chargers at once if they are not super slimline style, and some chargers slightly block the USB outlet so that it's not useable. This is annoying, so I usually am only able to charge two devices at once. I may try an extension cord at some point, but I worry that it might blow a fuse somewhere. I wish that the design of the outlets were changed to better accommodate using all three outlets at once, or remove one power outlet and put in more USB ports.
Another thing to note is that this device uses a fan to prevent overheating. It is loud enough to be heard, but not so loud that I need to turn up the radio or talk louder to compensate.
In some vehicles, I have noticed interference with the radio. This is not present in every vehicle I've used the power cup in. In my personal vehicle and most work vehicles I do not notice any interference, but it has caused problems in a few vehicles I've used it in.
Something else that I really love about this inverter is that it's cute, without being ridiculous. I've had a few people ask where I bought this. It also looks like a cup of coffee (duh) and sits nicely in a cupholder, so it's not quite as much of a theft target since it blends in a little.

Durability: This is why my frustrations with the outlet placement are overall less of an annoyance. Most inverters I've used have died swift deaths, either due to mishandling because the outlet stuck out or cheap builds unable to handle more than six months of use a few times a week. The power cup, however, has lasted well over a year at this point and is still going strong.

Price: Comparable to the cheap (in quality) inverters I bought at big box stores. Definitely worth the price I paid.

Overall: Despite its flaws, I find this to be one of the best inverters I've used in terms of price and durability.

Sadly, it is not as good quality as the first one we bought. This is much cheaper and stopped working a week after we bought it, after struggling to plug anything into it.

I am not big on too many gadgets, but my husband AND I love this thing- we literally fight over who gets to have it in their car, haha! It charges everything really well, and has held up over time (2 years and still running!). We bought a second for my mother-in-law because she saw it and was so impressed with the speed it charged her cell phone.

Only flaw (and I wouldn't necessarily say it's a flaw) is that it makes a light buzzing noise sometimes when it charges. Could be that we spilled something on it when driving across country or something like that, and it's not annoying to me at all, so I still give it 5 stars.