anybody know about 2-post hoists?

Rotary is a great brand. We bought our Rotary lift about 6 years ago and it's been very dependable. I want to say we paid about 1500 to 1600 for it used (but it was barely used). Like others have said thicker concrete is important to support it. We lift out 3/4 ton quad cab cummins no problem and it's rock steady.

Oh and it's the asymmetrical 2 post hoist as can be seen in this picture lifting my dads 70 Cuda.
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how high is your ceiling? I see you have the auto shut off above the car roof. How does it work? Is it foolproof?