I don't even do this for a living being but it's extra cash and quite fun.
The big thing that always pops up if you look at the above is: broken glass, overheating and clogged cooling systems (dust) and soldered on disposable components.
All this was fine until someone brought me an iPad 2 as well with a smashed screen. Was a total bastard to get inside, just like it's suggested in the article. Took me 20 minutes but I'm less forgiving and know how the materials all feel and how durable they are.
Absolutely terrible that Apple are guilty for making this situation even worse with their shoddy design. It's annoying because I've got a 2011 MBP I'm using as a workstation at the moment and I'm wary about upgrading it to an rMBP when it's no longer supported and not repairable as there's nothing I can do to an rMBP apart from take it back to the Apple Store and get a replacement (or sue them for our statutory 6-year fit for purpose in the UK).
Total disaster on the horizon. Give me a thick, repairable laptop over some thing disposable trinket.
My only choice is to go and buy a Delll or a Mac Mini next time.