My office has been using this photocopier for about a year now. It's in a 24/7 pharmacy so it's being used constantly. I give it the two stars for being able to keep up with our demands, the speed is acceptable.During the past year it's developed numerous problems. The machine has displayed system error messages on about 3 occasions and I had to call Sharp support and type in their secret button combinations to get it fixed. Sharp witholds troubleshooting information from their customers in order to benefit and secure their tech support department.Sharp gave us a refurbished replacement unit and it eventually started having the same problems. Now the machine makes a loud humming noise after every copy, though I suppose you can get used to the noise after a few months.The toner cartridge has also leaked inside the machine a few times, causing a big mess we had to vacuum up.It's come time to replace this guy. I'll be trying a different manufacturer, perhaps Brother or Canon.