I've had Macs for years and years. This guy is replacing a 2007 iMac stuck at OS 10.11.6. Migration Assistant worked like a charm (overnight) to move apps and data from the old machine. The new M1 processor and solid state drive combine to make a quiet device that boots quickly and starts applications "right now". Most old applications work in emulation through Rosetta2, but some of mine were so ancient they needed an upgrade to run on the new OS.11 (Big Sur).