dude,this is the 21 century,who the hell still uses post lifts 
while i spent 12 years working at a shop that had post and above ground......i'll take a post lift any day. they go up faster, they're more steady, they take up less room, and in my case, they're already there when i moved into this place. i have a 2 post lift in the first bay. although it's rated for 9,000 pounds, i had an e250 on it.......i will not do that again. my post lifts, which have the same rating i believe hold that same e250 rock steady.
i gotta admit though....when doing transmissions or exhaust work, i DEFINITELY like the 2 post.