I just bought a 4-post lift myself.
After a ton of research and talking by phone to almost all the companies out there,I have come to the conclusion they are all about the same excluding some commercial units.
For the hobbyist,just chose to purchase from an established company so you can get decent costumer service should you need it.
They are all made in China,even Bendpack,just at different factories.I have learned there are around 250 different factories manufacturing lifts in China to be sold all over the world.
Most have the Ladder lock design,which is best,some have 3rd party certification but you will pay 400 to 500 bucks more for the privilege.
Everybody says theirs is best will loads of scare tactics regarding others.
Find the best shipped price and you are good to go IMO.
I personally went with this Company....
http://www.bestbuyautoequipment.com/4-Post-Lifts-s/290.htm