Summary: I bought a Dell 3115Cn in September of last year originally running Mac OS 10.5. While the 2155cdn is a different printer, this is a general comment about DELL functionality with Apple. Product worked fine (printing, faxing, and copying). I'd give those functions 5 stars.
Buy at your peril. If it breaks down out of warrantee dell says it can't be fixed.
25 February 2014
Summary: I was offered an upgrade by dell to this machine 14 months ago due to a software problem with my previous machine which was only a couple of months old. It was a bit compicated at first but once we got used to it, it was ok to use. We then got a paper jam.