Google's servers are far more likely to be up than yours, that's just not a valid reason. Those charts are nice, there's nothing cheap looking about them, the real issue is load, will your load exceed what Google allows per day, if so, do your own charts, if not, nothing wrong with using Google.
You're right. I should rephrase. I meant uptime more in the control sense of the word. If Goog were to decide to stop allowing this API to run or in some way change their terms of use, there would be a problem. I guess it's the control freak in me.
