I say evaluate the repair by inspection and driving. If the work was done well, it should be basically as new. With that kind of damage, I'm sure the rear subframe was replaced and straight body panels were used. I would say the purchasing a rebuilt car for a large discount makes plenty of financial sense. If it runs and drives as it should and costs less, then it makes more financial sense than a more expensive car that was never wrecked. A buddy of mine got his beautiful 540 BMW nailed by a drunk. He wanted the car to be totalled but the insurance forked out $20K for repairs. His settlement with the drunk covered the reduced resale value of the car and then some. When he got it back, he expected to dump the car and buy knew. But after driving a rental for 2 months, his 540 felt like an old glove. It drives perfectly and a few previous problems were fixed in the process. He now plans to keep it till it dies.