As I recall, the Sawyer unit was a low-rent projector. Image quality was fine. But until you are confident with it, try cycling the unit manually to make sure it does not crush your slides.
The Kodak projectors were the work horses, with a gravity feed which was not likely to damage slides, but old slides that were abused were a problem.
Leitz made an expensive version with superior optics. I never used one, so no comment on that. I’m pretty sure I still have my Kodak, though I have not seen it since about 1971 or 1972.
Whatever you do, do not touch the bulb with your bare hands. The sweat on your finger tips will etch the bulb and cause it to fail in just a few hours.