Hello, I am seeking some expert opinion. I have to purchase an ultra low temperature freezer (-80C) for a scientific lab. I recently was warned by a friend (who actually knows as much about freezers as I do – almost nothing) that in the past all good freezers used the same, reliable compressor manufacturer, which quit making them about 5 years ago. Since then, rumor has it that none of the new freezers are reliable. So, I was advised to purchase an older, used freezer instead of a new one. Is there any basis to this rumor? If so, what year did they go bad? If not, do you have any option about the most reliable ULT freezer maker?