I don't want to start an evaporator war, but I think it's an important question, when one is considering a very time-consuming and expensive job.
Here's what Steve B. said in 2000:
"We use a copper tubed evaporator that we sell for around $300. We do charge about 15 hours labor to remove and replace the evpaporator, five vacuum servos, retrofit and charge. "
Do you still recommend copper evaporators?