Apple iMac MK452LL/A 21.5-Inch 4K Retina Display Intel Core i7 3.3GHz 16GB RAM 256GB SSD (Renewed)

My early 2009 iMac was still working well, but it was limited in ability to run the newest software. It had a 24 inch screen, so it was a large one. I upgraded to this late 2015 iMac with a 21.5 inch screen. The better resolution on the new Mac makes the smaller size be no problem.It came with El Capitan operating system, the same as on my previous iMac, and I was afraid that I would again be unable to upgrade. However, after transferring all of my files to the new computer, I downloaded and installed Mojave. Man, it works well! Faster than my 2009 iMac and with new abilities. I don't know why the refurbisher did not install the newer operating system (2 steps up); it is free.One thing I had to adjust to: I used Excel on my old Mac. It was an early version of the spreadsheet, bought when I did not have to have a subscription to use it. I was happy with it. However, with the new iMac I am unable to use the Excel spreadsheet except for read-only. The same is undoubtedly true for Word, although I haven't tried it. (Somehow Microsoft knows when you change machines and try to transfer Excel to the new one.I use a spreadsheet for only 1-2 hours per week, and I refuse to pay Microsoft $60 a year to use it. So I opened the 8-10 Excel spreadsheets into Numbers (Apple's answer to Excel). Some things are different, especially graphs (which Numbers calls "charts"), but I have been able to to everything with Numbers that I did with Excel--and Numbers comes free with Mac. I can even export a Numbers 'sheet as an Excel spreadsheet for my few Windows friends.I have used Apple's Pages rather than Word for some time, so that is no problem.The computer came with the small Apple keyboard and mouse. I had a large keyboard with a number pad, and I will continue to use it. I do like the Apple mouse, however, and am using it.Needless to say, I am extremely happy with my iMac, as I have been with all things Apple.

I put this iMac into service February, 2018. Even though it was refurbished, it seemed to be in new condition. Everything works and it is much faster than other Macs I have (due to Quad core). The screen is bright and sharp. The Magic Mouse is great. I wish the keyboard had a ten key number pad. I've been back with Mac since 2004 after living in the PC world for almost 20 years. Neither world is perfect, but I enjoy the integration of the Apple eco-system and use it to the fullest with iPhone, iPads, and AppleTV's. The way that family works together is without parallel in the PC world.========Update (2 years later): Ultimately I found the internal 1TB HDD to be too slow...bootup took forever...so I took it to my local Apple certified support store and had them swap that out for a 256Gb SSD. It now boots very quickly and seems to have less problems with the OS clean-installed on that SSD. I keep all data on an external Drobo drive so that all that is on the SSD permanently is the OS...which leaves about 185Gb of temp storage space for working space. It also works well for iCloud documents which disappear from the local drive after a period of inactivity with a given document.==========Update 2 (after 4 years)I have four Macs in operation ranging in dates from 2010 (running El Capitan) to a new M1 MacMini. I do have Big Sur running on this 2015 iMac without problems or stalling issues. Of the four, I think this iMac may be the most dependable and robust of the lot. It is really a good computer (after the SSD upgrade I mentioned above)....maybe the best Mac I've ever owned (and I'm sure I've had at least 10). This is a heqq of a value.

Says in description that it may not come with original keyboards and mouse, which is fine but I was expecting at least comparable ones. Came with cheap wired keyboard and mouse which is really disappointing. Computer responds slowly to keyboard and mouse that it came with. Until I can dish out more money for a better keyboard and mouse I cant necessarily be sure that it isn't the computer that is overall slow. Will update review when I get a a keyboard and mouse that isn't garbage.UPDATE: don't waste your money. This is absolute garbage. I've gone through 3 different mouse and keyboard combinations and all of them have the same issue: the computer doesn't respond to them properly. It will add extra letters and ignore others randomly. Trying to sign in is a nightmare when your keyboard doesn't work. The computer is slower than molasses in winter. I wish I used it enough during the return period to be able to send it back, but I'm stuck with it. Wasted money, steer clear.

This 21.5 inch model is probably designed to manipulate people into buying the 24 inch model because when you login the cursor is too tiny and size at login cannot be changed. Default text font size is too tiny and a grump to read and that cannot be changed. Apple's dictionary is an embarrassment. OS Monterey shows the dumbing down syndrome in the new Maps app which is visually useless for educated people. Spellcheck is also an embarrassment of ignorance. Safari is programmed to be asinine by erroneously changing my text to nonsensical words. When I compose text and need to make a correction the app places a highlight at the error rather than a bar so I have to click several times to get the bar, otherwise the app will delete all typed text to the right of the marked spot. Safari is not welcome at some sites.