Plenty of restaurants use these, and in general, all brands of slicers are pretty reliable. Keep in mind that in a restaurant or deli, they get several hours of use every day. Get something you feel safe and comfortable using. Some of the older slicers are pretty spooky.
If you are fortunate enough to find an automatic slicer, that might come in handy for hams and sausages and such. Look for one with an adjustable stroke so it's not going back and forth the entire distance if you are just slicing a salami.