New Relic could not handle the query aspect of having at around 5TB+ terabytes of logs (I know, a ludicrous amount of logs, but that's what it is) per day. Their architecture does not really allow for that. For small volumes I guess it would be enough. Not to ingest, that it did fine, but to query them under a reasonable time frame without a timeout, that's where it couldn't handle the high volume.
Also, their support service, while trying to win us over, that is, in their best moment, was nothing really stellar. Favouring sending us sales/presales people to solve technical problems.
It didn't leave us a good aftertaste.