Amazon .... what is this?

First of all: this review does not apply to the clock. but Amazon. I have bought the clock as 'new', I have received a clock whose packaging has been opened. Amazon had 2 such clocks slightly cheaper 'hand' as in the offer. This offer was to
my purchase away. What is going on here? I did that happen about 2/3 years ago ever since I was the way u. Her too stupid, because the clock
was new and still works (a Garmin).
Although I previously had good experiences with Amazon, I am a bit disappointed. The clock of course I send back.
To clock yourself: Sure, for testing I had no time. But the clock makes a high quality impression. To me she is not too bulky.
What has struck me: The ascent and descent measurement is a joke. Since working with a resolution of 5 m, ie when it 9m
uphill and then down again, measures 5m the clock. If you go by bike in hilly terrain, covered about 30% of all distances ridden height
meters away. I know 'that of other manufacturers.
The clock measures the absolute level of the meters. Why can not they just add up?
I have two 'cheap' cycle computer sigma and VDO for 50, - Euro. The can do that. Why can outrageously expensive general purpose clocks
not that one?
That should be no devaluation, because I would be the clock so certainly not do justice in a single package.