Earlier quoted context omitted.
Logitech make good products, their speakers have always been quite good IMO. I'll never forget in high school a buddy and I had two of the same Logitech X-540 speakers. We plugged the speakers together and pumped it through effectively a 10.2 setup.
I've been having terrible luck with Logitech, and decided to never buy from them again. An $80 speaker set's audio input jack broke, and Logitech absolutely refused to fix it or help me in any way since it was a month or so past the one year warranty. I live right down the street from Logitech and could have just driven out to their HQ, but they completely stonewalled me.
2010: replaced a ~18-month-old MX400 with an MX620 under warranty after the left mouse button became unreliable (without proof of purchase)
2013: replaced that MX620 with an MX705 after I asked if it was possible to buy a replacement wireless receiver (part of the USB connecter had broken off IIRC) - I had assumed it would be well out of warranty as the original purchase was back in 2008.
I can't say if the difference is because I'm in Europe, they've changed their practices more recently, or it's just luck of the draw.