Are There Any Special Concerns?

I am just getting started in the process of opening my own restaurant business. I was thinking of purchasing used restaurant equipment, and I was wondering if there are any special concerns I need to be sure to address when I am shopping for used restaurant equipment. Are there any problems I should make sure to check for before purchasing this equipment? How can I be sure that it will work well? I don’t want to waste my money on faulty equipment. Does used restaurant equipment come with a warranty? And is it a lot cheaper than buying new equipment?