Considering adding a lift - thoughts on 2-post vs. 4-post?

I have a 2 post Atlas lift I bought from Greg Smith Equipment. I haven't had any problems with it and as long as you have at least 3000 PSI 6" thick cement and you are careful with the installation (make sure all of the cement dust is vacuumed out of the holes and I added epoxy as well) you shouldn't have a problem. Good Luck