There are plenty of New Relic competitors. Datadog and AppDynamics both have APM products that support python, for example.

The feature set between this and New Relic is quite different. To oversimplify, New Relic works at the python library level, and StackImpact works at the python interpreter level. The functionality is potentially complementary.

Not to mention their laggy as anything JavaScript website, I love what you can get out of new relic if you try but you have to pay a LOT of money and you have to accept that their product has become slower and less user friendly over the past three years.