IP SLA Probe integration with NMS

Hey /r/networking,

So I've found a lot of useful information in this post here:

https://www.reddit.com/r/networking/comments/3gmvyp/what_are_you_using_for_sla_monitoring/

I'm curious though: for those of you that are/have deployed NIDs and use them with "popular" NMS suites, can you share your experience with me? I'm curious about the prospect of deploying these probes with a product like Riverbed, or maybe an open source alternative, like Nagios (or any of the similar alternatives).

Any details to the setup process, how well did it integrate with the monitoring suite...