The compressors in these jumperstarters usually aren't good for much beyond blowing up a beach ball or bicycle tire, they take a LONG time on a car tire or larger. They will get the job done eventually though, but I always wonder if it's going to wear out in the middle of a job due to how long it runs.

you're fulla sheet clown...I've used one of these several times to fill a tire. You pop off garbage on a daily basis. Stop making sheet up.

Maybe your time is worth nothing or you have no idea how much better a "normal" air compressor is?

For car tires, keep a $10 floor pump in the back of your car - I agree with the first poster that they are slow for those; does an okay job on inflatable mattresses; your fellow campers will hate you though.

I agree with the first guy..BUT I seriously haven't tried this brand. Perhaps they have improved?

^ I'd imagine the air compressor is the same in all those made by Vector/Ningbo Beisheng Electrical Co. who make most of the models & rebrands on the market. Primary airflow rate problem is easy to pinpoint, it's a tiny little compressor to fit in the available space, I once took mine out of the jumpstarter to lube it and was shocked that it is only about the size of a couple stacked playing card decks.

http://www.qrbiz.com/product/525426/vector-jump-starters-12v-10ah-17ah-400amp-900amp.html