Originally posted by Kremithefrog:
There have been problems with a good many x50s with going in to self cal too often and eventually needing service. Mine hasn't done it, but a friend's has.
Mine did that the first day I got it. Replaced it for free 
Those 6 year warranties off ebay are good for somethin I guess 
I have mine mounted just above the rear mirrow. It still has plenty of room out the back window and gets tons of range way up there. I laugh when I see others with theirs mounted on top of their dash 
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