I'm using Papertrail and the experience so far is not so great. Dashboard UI looks like it wasn't updated since 2005. Also, the free plan is a joke: 10Mb of logs per day. When I started I managed to stay under this quota, but recently I've added a couple features that spits additional log data. Now I have to either filter some valuable logs or become a paying customer (which I can't afford for such thing as logging).

Looking to migrate to https://logentries.com At least their free plan offers 5Gb/month.