The basic frame shape and dimensions of most ATV jacks are the same. Some may have better quality hydraulic jacks and heavier metal. Mine is actually a Goodyear, which I bought used for $75.
If you are working alone, the ATV jack makes removing the engine a one person job, although it always best to have a buddy for safety even if the buddy is not mechanical.
Someone mentioned it earlier in the thread, but you need to pay attention to where the engine sits compared to the jack frame when the jack is lowered. The first time I dropped my motor, I could not lower it all the way down because the muffller was hitting the jack frame
. If this doesn't make any sense to you now, it will as soon as you lower your motor if it isn't properly positioned on the jack. I am actually going to extend the arms of my jack with some angle iron.