[amatai]

Used papertrailapp.com but as the number of servers grew, this became expensive.

Moved to EL + Kibana, but not liking the interface yet and it doesn't seem to have 'tail -f' kindof functionality.

[enjo]

We use paper trail. I suppose expense is relative, but it's absolutely worth it to us. They've really nailed log search, which is what is really important to us.