Hi Jonas! You might be interested in our Mixpanel integration: At Bitdeli, you can create all the segments and metrics you need by running custom analytics scripts for all your raw historical data from Mixpanel - all without changes to your current setup.
We like to think our approach as best of both worlds: Get the beautiful interface and intuitive functionality Mixpanel provides with the ability to answer the occasional hard questions about your data.
Feel free to drop me a line at jyri@bitdeli.com and we can help you get started!