
I've got a set of the Quick Jacks. I also have a 2 post MaxJax mid rise.
Seriously, get the 2 post!
Doing an engine swap with the QuickJack has had me cursing my lazy ass for not changing bays for the Bus and the 914, so the 914 could have the 2 Post lift.
The QuickJacks only BARELY gets the car up far enough to change an engine, and that included stacking the rubber blocks up to get the back a few inches taller. You really need to remove the valence to pull a motor. Or you have to strip the motor while its still in the car - which sucks. In the pic above you can see that the rubber blocks are doubled. You are not supposed to do that, but it worked and the car is still super stable.
When you are not using the QuickJacks you have to store them. Yes, they do have rollers, but they are pretty heavy, and they are cumbersome to get in position to lift the car. I've been keeping mine under the Bus. I would not store them under the 914, or under any modern car. Keeping them on their sides against a wall is also a problem. My GF broke her foot last spring when she tried to move one to get at something else, and it fell over on her foot. Again, heavy.
MaxJax also are "portable" and have wheels. I say portable in quotes because you have to remove 10 big bolts from the posts that hold'em to the ground. But once free, they actually take up less space against the wall then the QuickJacks, and are less likely to tip over.
Once the car is up in the air, QuickJacks are really REALLY stable. I would feel comfortable leaving the car on the QuickJacks all winter, and I would not feel right doing that with the MaxJax (though I have and it was fine.)
And of course you are still on a creeper with the QuickJacks. The MaxJax you can use a rolling office chair under the car.
The MaxJax are a little more expensive now that they are owned by Bendpac, and its not quite as portable, but I think its the way better option if you have a floor to bolt them down to. Obviously - if you have the ceiling space, get a full size lift. But most of us don't have that in our garages. Of the midrise "prosumer" lifts like the QuickJacks and MaxJax - the MaxJax is better.
Zach