The first mac I ordered from Kanga booted up and I installed Catalina.  When I tried to use Migration Assistant from a Time Machine backup from my Macbook Pro, the process failed after 24 hours waiting.  AppleCare had me run a diagnostic on the hard drive which failed. After some back and forth the vendor, Kanga, agreed to accept the return.  I sent it back to Kanga with a smooth refund. Kanga included a USB keyboard/mouse by Macally.  I've received a second machine from MASTERTRONICS which comes with an apple bluetooth keyboard mouse.  The Kanga machine seemed fine other than the failed hard drive, but it was too short to know.  It came packed in generic packing, but was well packed. The MASTERTRONICS came in the Apple box packed like new with all the protective screen covers, with a new bluetooth keyboard and mouse.  For the price, I would pick the MASTERTRONICS as a nicer unit. Update: I've had the second mac for about two weeks its its running perfectly.  I'm coming off an 13" Macbook, so the 21" screen is a huge improvement.  I don't know what I would do with a 27" screen, but I'm not a power user.  My biggest complaint, which is something I knew before I purchased is the difficulty of upgrading the ram, which so far I don't need to do; 8 is enough. For the price, its a good value for almost like a new machine.  I agree that for a power user, upgrading to a solid state drive and more ram would be nicer.Update: I was having huge problems of slowness with this mac for the last year. I suffered until I fixed it today. I upgraded the RAM from 8 to 32 and got a solid state hard drive. I don't know which of these two things fixed it but its fixed now. I can open tabs and do multitasking for the first time. My thinking is tied to the speed of my computer and now I can think faster. I should say that the upgrade is not for the faint at heart. I recommend IFixIt.