These things are amazingly well-engineered and made in the USA. These are the gold-standard of the automotive ramp industry. Anyone who owns a Corvette, Porsche, Viper, etc. is likely using these. If you ever watch the SEMA show on TV, take a look at every car that is elevated off the floor Chances are it is sitting on a set of Race Ramps. Here's an extreme 2-piece ramp in action... :D
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I'm not saying you need to spend $250 to lift your Mirage. I'm just letting you know that there are other options out there.