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I'm very pleased so far, but as I said, it's too early for me to tell something.

> However, it didn't scale that well for us.

What kind of scaling problems did you encounter ?

In fairness to Piwik, it was some of the custom metrics that required more processing power. We ended up doing delayed batch processing for them.

Towards the end, IIRC, the calculation of unique visitors within a custom range was also slow.

Last I checked it only runs over a MySQL.

I don't know how many visitors and page views you have, but that's a red flag for most established sites.