I've been using Solarwinds now for six months with my new employer, and recently obtained my Solarwinds Certified Professional cert.
Previously I used Nagios and had to manually configure text files on each new host and the server, followed by a restart of the service.
Using Solarwinds is so much faster. I can add a new node in less than a minute as compared to several minutes of tinkering with manual config files.