I've probably had more Apple kit than most but....
From
1 x Mac Mini
1 x Mac Pro
1 x iMac
3 x Macbook polycarbonate
2 x Macbook Pro 17" (just prior to unibody)
1 x Macbook Air 11" 2012
1 x 15" Macbook Pro retina
5 x iPhones
3 x iPads
2 x Airports
1 x Apple mouse
1 x Apple touchpad
1 x Apple white keyboard USB
1 x Apple white keyboard Wireless
That I can remember....
We've had (not in any order)
1) Mac Mini - case replaced due to power button failure (under warranty <1yr)
2) Apple mouse - replaced due to failure of little ball on top (under ext warranty <3yrs)
3) 17" MBP - motherboard failure (under ext warranty <3yrs)
4) 17" MBP - battery failure, it expanded and gave off hot gas which burnt my leg (under ext warranty <3yrs)
5) 17" MBP - battery failure, it expanded and failed (under ext warranty <3yrs)
6) 17" MBP - battery failure, it expanded and failed (replaced out of warranty!)
7) 17" MBP - PSU, end fell off (replaced out of warranty! 4 years old!)
8) 17" MBP - PSU, end fell off (replaced out of warranty! 4 years old!)
9) 13" Macbook, polycarbonate top/keyboard, cracking (replaced <1yr)
10) 13" Macbook, battery failure (replaced <1yr)
11) 13" Macbook, battery failure (replaced <1yr)
12) iPhone 3Gs, 1 pixel failed on screen (replaced on launch day when I got home to find fault)
13) iPhone 3Gs, software issues! (replaced <1yr)
14) iPhone headphones, fell to pieces after a week (replaced <1yr)
(1) Computer failed to power up. I had spilled a bottle of blue ink on top of it 4 months before (don't ask) but this had nothing to do with the fault. Apple replaced the bottom case despite the blue ink stain without hesitation.
(3) Computer failed to power up. No idea why this happened but took it into Apple store, did some shopping and collected it 3 hours later.
(6,8) When I bought the MBA in January I complained about my 17" MBPS's PSU and battery which were out of extended warranty but I felt that the faults were known issues and the two parts had been replaced 10 months previously - They replaced them both again!
Several battery replacements above. Apple will replace any Macbook battery with under 300 cycles and within 1 year of previous replacement (or more if you are lucky)
Currently one of the 17" MBPs has a failed Nvidia chipset. This is going to be re-balled next week. It is just over 4.5 years old but I have spoken to Apple and they are going to look at the step by step repair photos and invoices and if it is down to the chip de-soldering itself they are going to give me the cost of the repair as store credit. This is pretty good when it is closer to 5 years old than 4 years!
Got to say that some of these WOULD have been replaced by non Apple companies but I would doubt that quite a few of them would.
1 Most companies would have taken one look at the blue Mac Mini and said errr no.
4-6,10-11 Most companies don't warranty batteries over 6 months
12 Most companies say 1 dead pixel is not a warranty failure
14 Headphones not always covered
7-8 Out of warranty
9 This was a product recall but I still doubt most companies would replace a cracked top of a computer.