first ways to identify most of the poorer jacks are that they use 2 gear mechanisms to rotate the release valve. The better jacks typically use a universal joint instead and the release is much more easily controlled. The only cheap jack that i've found that has a nice smooth easily controlled release is the 99 dollar jack at checkers/kragen as seen here at partsamerica.com
This jack has a 3 year warranty and since i use it virtually every day of the week its turned out to be a very good jack for the price, its a copy of a lincoln jack thats copied pretty well. I turn mine in once a year to checkers and get a new one. I think i'm now out of warranty and may actually have to buy one if it breaks on me. I have 3 floor jacks at any given time and typically have used jacks from costco or sam's since they are usually the best bang for the buck but this checkers jack has turned out to be a very good jack. It won't fit under dropped cars though you have to drive up on boards or lift under the jacking points on one side to get the car high enough to get the jack under.
Any jack of equal or better quality than this is typically going to cost 2 to 4 times as much money.
Originally Posted by Alpinewhite