Another InfluxDB user here. I'd done some evaluations with OpenTSDB and the Graphite suite, and while I had some concerns with stability and maturity the main things that sold me on it were:

* No dependencies. Compare this with setting up HDFS/HBase and Graphite which is a real pain in the neck to manage, especially since my tsdb has to run on an arbitrary machine pool in a sandbox.

* Active development. This is a big one. Releases have been coming steadily and Paul & co. do a good job of having a real roadmap and chipping away at it; this is probably my tipping point over Graphite.

* Clustering. Maybe it's not there yet, but see above. Most tools in this space are not elastic at all.

* Grafana integration - seems like there is a good bit of momentum in that project in general which is promising.

PS Reading this it almost sounds like an ad, no I'm not affiliated with influx.

PPS logfile configuration for rotation/cleanup would be a nice-to-have enhancement ;)