I don't. It's quite difficult to do complex queries and its query language has a few gotcha. I think it's quite good and one of the best solutions today, but I look forward to something as simple and as fast, but with a proper query language.
PromQL from Prometheus has steep learning curve because of lack of good documentation. When you understand PromQL basics, then it is much easier to write typical queries over time series data in PromQL than in any other query languages (SQL, Flux, InfluxQL, etc.). I'd recommend reading the article about PromQL basics [1] and then feel the power of PromQL.
