[jasoon]

We got frustrated with the UI on Loggly and wound up moving to Logentries (https://logentries.com/).

I've not used Papertrail, so can't compare to them, but it's significantly easier to use than Loggly, they've been kind to us through the odd overage, and it does what we need it to do (Centralise a load of application logs and allow us to search over them and set alerts). The live tail feature is nice as well.

[doublerebel]

Also have had great experiences with Logentries. Easy to integrate on every platform/OS, very configurable alerts, team has been pleasant and responsive to pull requests.