I put in a secondhand two post hoist about six months ago.
It's the sort of thing that if you don't have it you don't really miss it.
But once you've got one it's surprising how often you use it.

Due to illness the brother-in-law of a mate of mine had to sell his business not long after he'd installed a new four post hoist.
So he offered the near new hoist to Pete at book value. Pete grabbed it! But then what to do with his (fairly) old two post?
So he offered it to me for $150.
And I grabbed it too! Couldn't get my wallet out quickly enough.
It cost me $900 to get it installed and certified; but it was still a bargain.
So it's legal for 3.5 tons for the next five years, when it will have to be recertified.