We use Scalyr for our logging and error alerting. It is very fast to ingest and query data, it's UI is easy enough to use and its cost is much better than most others. Integrating Scalyr with both the server and client was reasonably straightforward. Most competitors have delays in ingestion, slower queries and/or much higher prices. We are very happy with it so far.

- Intuitive interface - Fast searching - Good filtering ability via queries

The best part is when my team can easily look at the problem on time and right to the root cause