Re: "the system has a more modern and 'flatter' look"
I wrote: "The laptop in question (HP zv5105) has low-end Intel graphics with "shared" 64megs of memory. It ran KDE 4.x quite nicely, and was my primary computer for 7 years."
Make that an ATI Radeon 9000 IGP w/64Megs of shared memory. It was my primary computer for 7 more years. I just booted it up, and it is running the video software that came with Slackware 14.0 (no ATIdriver). It works fine, I still use it on the road when I'm in a place where it might get lost, stolen or strayed (nobody is going to steal a 15 year old laptop!).
She started on Slack 9.1 and was updated as Slack was updated. The old gal got wiped&re-installed for a couple releases of Slack, after major architecture changes. She's now running Slack 14.0 -stable ... I'm tempted to update to Slack 14.2 -stable, just to see how it goes. KDE has never even stumbled in all that time (aside from issues that everybody was having, of course).
They say the memory is the first to go ... or maybe I forgot it was ATI video because I never thought about it again after the initial installation. Still, not too bad for a 15 year old machine :-)