I have had to deal with Garmin CS twice. The first time was right after I bought my 60csx. I knew very little about GPS units and the software needed. I picked up a map update rather than the full version. The store I bought it from would not take it back as it was opened. Called Garmin, they said send it in and they would send out the full version. I was impressed. They did not have to do that.
The second time my backlight stopped working. Called, they told me to send it in. So I did along with everything that came with it (CD, cable, SD card, etc). I only got the unit back. Called again and they said I shouldn't have sent everything in. I know that now! But they were very helpful and did end up sending a CD and SD card but no cable yet. Even though it was my fault for sending it all in, I was disappointed they kept it all.
Overall much better CS than many other companies.
Mark