PolyScience is the godfather of culinary sous vide circulators. They introduced their first immersion circulator, the Model 73, back in 1973. Did PolyScience know about sous vide cooking back in the ’70s? No. PolyScience makes laboratory equipment with precise temperature controls; the 73 was invented for lab use.
In 2007, PolyScience was contacted by professional chefs - Mathias Merges and Wylie Dufrense - asking about their immersion circulators, and if they could be used in a professional kitchen. Philip Preston, president of PolyScience, is a enthusiastic hobbyist cook and immediately saw the possibilities. Soon after that, PolyScience started selling their first immersion circulator designed specifically for cooking - now known as the PolyScience Sous Vide Professional Classic, which costs about $1100. 
This is the first sous vide unit I was aware of, and I lusted after one for years - but oh, that price. It is designed for hard use in a professional kitchen, and I couldn’t bring myself to spend the money.
PolyScience was paying attention to people like me, enthusiastic hobbyist cooks. (Sound familiar?) They designed new immersion circulators for home use, with prices to match. PolyScience Culinary sent me a PolyScience Professional Creative Series immersion circulator for testing and review. I’ve used it for the last month, and here’s what I’ve learned.