I'll be brief and explain what I did not like about the mac... If you purchase a similar model iMac with a fusion hard drive, just be prepared to expect some consistent processing lags. There is also some lagging at startup. However, this is the nature of HDD components vs solid state drives.  If you are somewhat handy and can follow instructions, the fix for this is simple: Install a compatible SSD. Problem fixed!  Now, my machine is ten times faster with ZERO lag.