Replaced my old iMac 27 with this Mac Mini M1, which turned out to be much cheaper than getting a new 27" iMac, even with a new 4K monitor factored in. However,  I did lose functions like adjusting my monitor's  brightness on the apple keyboard and a good quality build-in speaker. The speaker in the mac mini is worst than my iPad, so an external speaker is  a must. Also, for some reason the mac mini did not detect my apple keyboard in the setup screen, I had to connect my PC's USB keyboard to finish setup and add my apple keyboard in my Bluetooth menu. App wise, most apps worked pretty good, but Thinkorswim, a stocks charting app I use, does perform worst than my old intel based mac.