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I bought the HCx off ebay cheap but never liked it. The 800 was 'gifted' to me for some work I did and then when I found its limitations (ie. it leaving me high and dry 450k into a 600k) I went straight out and bought a 1000 and 30x so this kind of shit didn't happen again. I bought the car Garmin while LEJOG training, because it was supposed to be able to accept .gpx files, so I thought I could load my route on their so support drivers could follow me exactly. I use a different one on different bikes depending on what my ride is going to involve. Sometimes take all three out although now I have the Sony I tend to only use the 1000 and 30x on long rides. The 800 is for turbo and commutes.
I'm going to use my Garmins until they die and then make the jump. It could be some time though - my 800 is still going strong and that's a few years old now. The 1000 is my main unit. I sold my HCx and have a 30x instead as my backup. Then I have the car one plus two of their extended batteries that I've loaned to a friend for a 24hr. I've lost count of the Garmin mounts I own - probably a couple of hundred quid worth of plastic. Fuckin' jokez.