I also got bitten by their handling of timestamp.
e.g. - scenario:
Your users create bookings (which are normally done in the future).
How do you approach this? Well you submit a date field in the document you send to Mixpanel. But then you figure out that ONLY time axis supported by Mixpanel is their timestamp. Which could make sense for an off the shelf service, since you probably really don't want to build indexes against random user data.
Ok, take 2 - so I only have one X axis available (the Mixpanel Timestamp), however you soon figure out that Mixpanel just silently prunes your future timestamp to @now.
The worst part for me was Mixpanel teams total bewilderment as to why anybody would want either additional time axes OR future timestamps.
Guys your service really shows promise for building a fast and simple to use analytics. I really don't want to roll my own analytics service just to show simple activity timelines to my customers. I also don't want to maintain and support the infrastructure necesary - at least not at this time. Please realize that there are other cases for real time analytics besides funneling users towards "Buy now!" or "Signup now!" pages.
Are there any similar alternatives (I searched quite a bit but found nothing) or on the other hand if there are not - would there be anybody interested in joining up with me to build a service.
