I expected a cheap peace of junk made in China and what I received is probably one of the best consumer products I have ever purchased. This thing is a miracle. I had historically used a Dremel on my Golden Retrievers. They didn't like it, but they complied.
Our one-year old Lab took to this trimmer with no problem at all. His nails are so short that they make no contact with the ground. Everyone comments on them - vet, groomer, trainer. It's a remarkable product. It's relatively quiet and, if you do it right, the light shines right through the nail so you can see the quick. Ours is a Red Fox Lab, so your success with seeing through nails on a darker/black dog may vary.
The trick is to lay the dog on its back with its head in your lap. Not all dogs will do this so you may need a little help from someone to feed some treats as a distraction. Mine didn't need any of it. Just take a little off every couple of days, avoid the quick and your dog will have perfect nails. No floor scratching and no car seat scratching.
If your dog is apprehensive, just hold it in your lap while sitting on the floor and give it some rubs and treats will turning the trimmer on low. Don't actually trim our dogs nails until it's comfortable with the device. When you do trim for the first time, just gently hit one nail and call it a day. Do it again later and use treats. Keep doing that and, in a few days, you'll have a great trimmer solution.
I would very much caution you not to get aggressive with this trimmer. It can be tempting to go crazy and take them all the way down, and some dogs may allow this, but it WILL hurt if you hit the quick, even though there won't be blood.
I would also recommend trimming the top part of the nail and letting the concrete wear down the under-side of the nail naturally. If you don't walk your dog enough for that, just carefully file the entire nail a little bit at a time. Doing this every few days keeps the drama to a minimum and will keep your dog's quick moving backward. Just remember to take the smallest amount off if you can't see the quick. Less than a millimeter.
I'm going to buy another one just so I have it when the one I have fails. It's that good.
Note on pictures: This is a very active dog. He hikes mountains and walks 4-6 miles per day. His nails look rough because he spends a lot of time on rough terrain. You could file your dog's nails with a nail file if you want them smooth. I'm going for short.