Last Wednesday, the H-Shifter on my G27 started to malfunction. The x-axis sensor or pot stopped working, meaning 1st/3rd/5th all shifted as 3rd, and 2nd/4th/6th all shifted as 4th.
I contacted Logitech straight away by telephone, and explained the problem. He emailed me, and asked that I reply with proof of purchase (electronic receipt accepted!)
The guy on the other end dispatched a replacement, which arrived today: a complete new G27 - not just the shifter - and I didn't even have to send the old one back.
So here I am with a G27 in front of me, and another (though with faulty shifter) sat boxed up in the other room
Thanks Logitech, great Customer Service!
I contacted Logitech straight away by telephone, and explained the problem. He emailed me, and asked that I reply with proof of purchase (electronic receipt accepted!)
The guy on the other end dispatched a replacement, which arrived today: a complete new G27 - not just the shifter - and I didn't even have to send the old one back.
So here I am with a G27 in front of me, and another (though with faulty shifter) sat boxed up in the other room

Thanks Logitech, great Customer Service!

+ 
only logitech item i own is my G5 mouse which is still rock solid
As my G25 is starting to age, I think the motors are starting to go as after 30mins or so you can smell them and the wheel is rather hot. No issues as of yet with the FFB though!