Our office has probably on the order of 40 magsafe chargers, and my home has at least 10 (not all of which are functional). The chargers fray and short out. They always have, and they continue to do so even in the most recent RMBP iteration.

This has been a continuous weakness with Apple chargers across every product line I've used back to the TiBook. They are pretty, and they are very functional, but they are not resilient.

I believe there were more bad ones in 2008-2011 than today; I haven't yet had a MagSafe2 adapter fail, and I saw child mortality on the T-shaped and L-shaped magsafe1 connectors after 3-6 months. The "yellowing and then die" seemed particular to one batch of insulation; regular fraying, sure.

I have one RMBP MS2 adapter that only works if the cable is positioned just right (ie, I can charge from it overnight on a table, but it's ineffective on my lap).

The new ones definitely do seem to be better.

Oh yeah, I have that problem too :( It's even worse when you have a speck hardshell case on it.

Most of my personal (~10) 85W collection is T and L shaped magsafe1 with the $10 adapter and magcozy (http://www.amazon.com/Cozy-Industries-MagCozy-Clear/dp/B00ER...) shock cords to attach them, because sometimes someone visits and needs a magsafe1. Those are even more sensitive to positioning.

(Great "life hack" is leaving chargers wherever you're likely to sit. I keep one in each bag, two on each desk, two at the couch, two in bed, one in the car.)

Twin adapters at desks in an office also works great, and of course conference rooms full of them. I was so annoyed when Lenovo went from 14V to 20V on the thinkpads.

That is a little scary. I would toss that sucker.

Perhaps the reason you have not seen any failures is because your usage is spread over 10 different chargers, instead of concentrated on 1?

Unless you have 10 different laptops in use simultaneously such that you are putting in 10x as many laptop hours as normal people...