Question about newer iMacs.

I'm thinking of upgrading from a 2008 24" Core 2 Duo to something a bit more modern. For those of you who own the newer versions that are difficult to upgrade the memory, or change the HD, have you had any issues where the drive failed and had to be replaced or found that you just had to upgrade the drive or memory, did you do it yourself (following Fixit instructions)?

If so, any problems?

via ehMac.ca http://ift.tt/1srUHnu