2 Post Lift

I've got a atlas 10,000 lb commerical. Had it 4 years, works flawless, no issues. Only thing I can say is that your concrete has to cure some 30 days prior to installing your lift.

this is mine

http://www.gregsmithequipment.com/Atlas-Apex-10-Plus
If that were true it would take me over 5 years to put up a 50 floor building , , I usually pour a floor every 4 days , strip and re-shore after 28 hours start next floor day after the pour . Your good to install lift after 4 days or less depending on concrete used .