The Viair 85P operates relatively quietly, with hardly any vibration, and it moves a lot of air. I use it routinely to top off car tires, which it does in a snap, and have used it to fill tires from flat in just a few minutes. Its price is pretty reasonable considering what a sturdy, high-quality product it is.You should choose carefully between the Viair 85P and its cousin, the 70P. With the 85P, you might think you're getting a more powerful compressor for just a few dollars more. Actually, BOTH compressors are designed to be the most powerful you can run from a 12V car accessory socket. With a limit of 15 amps, the two products just use the available power differently. The 85P has a larger stroke to move air faster, but the motor only has enough torque to operate up to about 60 psi before it blows its own fuse or that of your car. The 70P has a shorter stroke and is a little slower, but will work up to 100 psi. The way you can think of it, if you're familiar with a manual car transmission, is that the 70P runs in a lower gear and can climb a steeper hill.If you know that you'll only need the compressor for automotive or higher-volume applications where the pressures are relatively low, you might prefer the 85P. It's really terrific for car tires and comparable uses. I imagine it's the one you'd want to use for something like an air mattress, though I haven't tried that. However, with the 70P you can trade off some speed for a little more versatility.I think the 85P is a solid product and I've rated it highly, but personally I made the wrong choice. I always imagined that I could use my great air compressor not only with the car, but also to pump up my tires when I got around to riding my bicycle again. Since my bike tires require 75 to 80 psi, that wasn't going to happen. I actually did manage to inflate them, but it was impossible to top them off. You have to turn off the compressor to get a pressure reading, and then the motor stalls when you turn it back on, blowing the fuse.By the way, if you do manage to overload the compressor and blow the fuse, it's located inside the 12V plug. Unscrew the metal tip of the plug to replace it. You need a fast-acting 15A 250V glass tube fuse. The 6x30mm AGC-type fuses are easy to obtain. You can even get them from or through Amazon.Of course, if it comes to that, it's possible that the fuse in your car will blow before the one protecting the Viair does. Personally I don't have that problem because I always run the compressor from the battery power pack I keep in the trunk for emergency engine starting. That way I never worry about blowing a fuse in the car or needing to run the engine to use the compressor. I recommend theJump-N-Carry JNC300XL 900 Peak Amp Ultraportable 12-Volt Jump Starter with Light. It's smaller, lighter, more powerful and cheaper than the power packs with built-in tire inflators, and of course it has an accessory socket. For the price of a bells-and-whistles Chinese-made power pack, you can get the better JNC product plus a Viair air compressor!