I could find only a few used Dettson snow blowers in a Google search. I suspect the company may be out of business.
However, as long as it operates OK (so you do want to see it running before you buy), there isn't much that can go wrong...and if anything does, you can probably fix it if you're handy.
Price is good, if it's in reasonably good condition.
I have a 72" rear blower (not a Dettson). Good unit, moves the snow way out of the way so once you've made a pass, it's done. Facing to the rear isn't that bad...best way (IMHO) is to twist in the seat as much as you can. I have a reverser transmission, so once I select a gear and set the throttle, I don't need to be doing much but steer and rotate the chute as needed.
As others wrote, for smaller accumulations (6" or so), plowing is faster. But occasionally, PA does get some major snows.
As far as the cold and snow...cab is better, but if you dress properly, it isn't too bad. Sooner or later, you will get covered with snow...wind changes...things like that. That's why I traded up for a cab tractor, BTW...Vermont winters are too **** cold!