Strong points: Performance is really exceptional. No problems running visual studio and SQL server. Battery life is great as well. I get a days worth of usage out of it. Bought it refurbished from Apple so I saved some money.
Weak points: Some annoyances with slow wake up and connecting to wifi after wake. If that is the trade off for getting incredible battery life then it is OK.
I've had it for almost 7 years. It doesn't choke on anything since I bumped the RAM from 4 to 12G - I was having issues with running virtual machines.
Operating System wise it's got a 50 meg FreeDos partition at the front of the bootloader for when I screw things up. There's Windows XP Professional X64 edition and CentOS 6 on one of the 250G, the other 250G has Ubuntu Studio 14.04. The 500G has Windows 8 that was upgraded over a Windows 7 installation. By default Grub2 boots to Ubuntu Studio (without the low-latency kernel). By default the system will boot to FreeDos if I've hosed Grub.
I wound up with two different size monitors because there was only one 22" in stock and on sale when the old 24" died. It turns out that the 20" rocks because of it's lower DPI/larger pixels. I can kick a window to it and read it from further away - i.e. leaning back in my chair with the keyboard on my lap (the MS NE4000 is designed to sit in your lap, ergonomically no less).
Away from the desk, I use my Android phablet - an LG Optimus Pro. Now that I've got a Logitech K410 keyboard for it's even more useful. There's also an old Vostro in the house and my ancient Toshiba Satellite 1805-S203 with Wary Puppy (the video connector to the display has become dodgy, unfortunately).
Printers are my current focus. The Brother MFC-5405 crapped out on Tuesday. The refurbished Citizen GSX-145 from ebay arrived yesterday ($5 buy it now plus $20 shipping). Waiting on the right cable from MonoPrice - I stupidly ordered the IEEE 1284 the first time because it sounded better and I had overwritten the Centronics and Serial cable brain cells. I put the HP LaserJet 2605DN up for sale on Craigslist. The Epson Workforce 1100 will go down to the family room. The Satellite may wind up a wireless print server. [1] I'll probably get a bespoke scanner at some point. But I will soon be tractor fed impact ribbon reliable for when I want to print.
If you've read this far, there's probably something wrong with you. But obviously not as wrong as what's wrong with me.
[1] I stuck a Broadcom wireless G daughter card out of an HP laptop with a cracked screen in it.
btw, are you having some laggy (high load avg) using yosemite?