CALLING ALL COMPUTER GEEKS😍

Im used to windows computers BUT I'm buying an iMac from Craigslist for $500 is this a good deal?
Mid 2010 IMac.This is my personal machine in excellent condition. Super fast - it has a 3 TB HDD and a 256 gb HDD configured to work as a Fusion Drive. 8 gb ram (2 x 4 gb). Intel i7 2.93 GHz.ATI Radeon HD 5750 Graphics. 2560 x 1440 display.DVD DriveIncludes Apple Wireless Keyboard & Magic TrackpadNote, this device has 4 memory slots. One slot does not work. This does not affect the operation of the machine with the current 8 gb.
No offense to the word geek I'm a geek myself just not with apple products lol